Science Chemistry Draw orbital diagrams (boxes with arrows in them) to represent the electron configurationswithout hybridizationfor all the atoms in SF2. The electron pair causes repulsion in SF2, hence, its final shape appears like bent molecular geometry. There are four different energy levels, each of which may hold a different amount of electrons. Notify me of follow-up comments by email. Due to this, the Fluorine atoms are pushed down which gives the compound a bent shape. In fact, both Fluorine atoms are also sp3 hybridized. There's a very important differen between oxygen and sulfur in terms of orbitals available for bonding. Because of this separation of charge, there will be a dipole in between the sulfur and fluorine, and these dipole moments will not be canceled out because of the bent shape(asymmetrical) of the SF2 molecule, and this makes it polar in nature. Sulfur difluoride is a compound consisting of sulfur and fluorine atoms. So according to the above table, the molecular Geometry of SF2 is found to be type AX2E2 which means the compound is either bent or nonlinear. Since the molecular geometry of SF2 is bent that means it has a bond angle. The compound is Polar in nature because the dipole moment between the Sulfur and Fluorine doesn't cancel each other. In SF2 lewis structure as the formula suggests sulphur is the least electronegative as compared to most electronegative fluorine atoms. Now in the SF2 molecule, the fluorine is the outer atom and it needs 8 electrons in its valence shell to complete its octet. Through the analysis of >1000 worldwide Arabidopsis natural accessions, we previously identified five predominant FLC haplotypes defined by noncoding SNPs (Li et al. There are many exceptions to the octet rule. The bond angle of SF2 is expected somewhere around 98 degrees. This is generally calculated with the help of the VSEPR theory. So, sulfur will be the central atom of the molecule. Check the stability with the help of a formal charge concept. Abstract. Draw the Lewis structure of SF2, showing all lone pairs. Based on the lone pair of electrons and bonds that are formed we can identify what can be the molecular geometry of a compound. Thus, the orbitals would be in a tetrahedral arrangement and the molecule would be bent. Hence, SF2 has poles in the molecule, where there are partial negative charges on the Fluorine atom and partial positive charges on the Sulfur atom which makes SF2 a polar molecule. They do not involve in bond formation. In the SF2 compound, sulfur is less electronegativity than fluorine. 3. Required fields are marked *. So, both fluorine atoms in the above structure completed their octet, because both of them have 8 electrons(6 electrons represented as dots + 2 electrons in a single bond) in their valence shell. Also in the SF2 lewis structure, there is the absence of double bonds and delocalization of electrons is not possible as it will disturb the octet stability. This SF2 lewis structure dimer shows peculiarity in bond behaviour and form recoupled pair bond dyads. The octet rule fails in dealing with ionic compounds of the transition metals. Why knowing about the polarity of a compound is essential? Since fluorine is more electronegative than the sulfur atom, the fluorine tries to attract the more shared bonded electrons towards its side and this will induce a negative charge on it. As we early explain the electronegativity value of sulfur(2.58) and fluorine(3.98), their difference is 1.4 which means the bond will have a polar covalent character. Put lone pairs of electrons on each atom. But simply, we can calculate it by diving the total valance electrons by 2 which will give valence electrons pairs. We get the final number 4, which corresponds to sp3 Hybridization. Also, the generic formula for SF2 is AX2N2 according to the VSEPR theory and its chart. The total valence electrons of the molecules are the sum of sigma bonds, pi bonds, and the lone pairs present at the valence shells i.e. So 2 fluorine atoms will share each electron with the 2 electrons of the sulphur atom thereby satisfying the SF2 lewis structure octet rule. The drug inhibits pre-mRNA splicing in vitro and in vivo and binds SF3b, a protein subcomplex of U2 small nuclear ribonucleoprotein (snRNP), which is essential for recognition of the pre . Is SF2 Polar or Nonpolar? 2021 Scientific Sarkar. Similarly, the electronic configuration of Fluorine is 1s2 2s2 2p5. First, the electrons are filled in 1s, then in 2s, and so on. As octets of Fluorine atoms are complete, put six valence electrons around each Fluorine atom. Now after we have seen every aspect of this compound from Lewiss structure to molecular geometry, we can talk about its polarity. Now, as we already found out the valence electrons of SF2 are 20. Now, let us move to what is the hybridization of SF2. Steric number = Number of bonds on central atom + Number of lone pairs on the central atom. [Overview with pH of NaCl], Is ICl3 Polar or Nonpolar? After sharing 2 electrons with each fluorine atom there will be 4 unshared electrons. Sulfur Fluoride is a highly unstable inorganic compound. As we already completed the octet of both fluorine atoms, now we have to complete the octet of the central atom which is sulfur in the SF2 molecule. As the shape is not linear and there is repulsion, we can surely say that the compound is Polar in nature. Complete the central atom octet and make multiple bonds if necessary. As we already know, In VSEPR theory each atom in the compound is arranged such that the compound becomes stable in nature giving a compound a unique shape. Due to the vast electronegativity difference, the dipole moment will be from the Sulphur atom to the Fluorine atom. The combination of these atomic orbitals creates three new hybrid orbitals equal in energy-level. Hence, the charge on the compound is not evenly distributed thus we can be sure that the dipole moment is not going to be zero. As the Lewis structure of the sf2 molecule has tetrahedral Bent geometry, the bond angle in the sf2 molecule is 98o. The bent structure is achieved due to the presence of lone pairs of electrons and bonds in the central atom. Multiple parameters limit the ability of a CRISPR/Cas system to . Q: Determine SF2 A. sp B. sp C. sp D. sp E. sp OD O A OE the hybridization of sulfur in SF2, A: Q: Determine the hybridizations of all the carbon atoms in the compound shown here. We get the final number 4, which corresponds to sp3 Hybridization. This is because it is less electronegative than the other atom of the compound which is Fluorine. (7 6 2/2) = 0 formal charge on both fluorine atoms. Your email address will not be published. Each fluorine has 8 electrons in its outer shell. sp sp2 sp3 sp3d sp3d2 An SF2 molecule is polar, nonpolar. You can also check the article on the polarity of SF2. Here is a MO diagram of another bent compound ie; bent shaped (SO2 molecule) and how the energies are distributed. That means we get 4 orbitals in total which is sp3 hybridization. Your email address will not be published. And fluorine atoms should place in an outside position of the molecule. These properties are: The shape and molecular geometry of SF2 lewis structure can be explained with the help of VSEPR theory. Is SF2 polar or non-polar? You can see in the image; that fluorine has a 7-valance electron. Sulfur has six valence electrons in its outer shell. If the electronegativity difference is between 0.4 and 1.7, the bond will have a polar covalent character. Select Draw Rings More Erase s F octahedral tetrahedral square pyramidal see-saw bent T-shaped trigonal planar square planar trigonal bipyramidal linear 2 O trigonal pyramidal What is the hybridization of the central atom? In the SF2 Lewis structure, both sulfur and fluorine are SP3 hybridized in sf2 molecules. Nitric Acid (HNO3); Lewis structure, Molecular geometry, Hybridization, and MOT, Sulfur Hexafluoride (SF6); How to Draw Lewis Structure, Molecular Geometry, and Polarity, Tetrahydro Borate (BH4-); Lewis Structure, Molecular Geometry, and Hybridization, Polarity, Butane (C4H10): Lewis structure, Molecular Geometry, Polar or Nonpolar. The angle that forms in SF2 is somewhere around 98 degrees. In the Lewis dot structure of Sulfur Difluoride (SF2), Sulphur contains two lone pairs of electrons while each fluorine contains three lone pairs of electrons. For SF2 compounds, Sulfur has four valence electrons that have not participated in any bond formation. (6 4 4/2) = 0 formal charge on the sulfur central atom. Save my name, email, and website in this browser for the next time I comment. Due to the presence of lone pairs on sulphur atoms and the electronegativity of fluorine atoms, there will be repulsion between the lone pairs and bond pairs. , the central atom forms two bonds with two Fluorine atoms and has two lone pairs of electrons. We have used only 16 electrons. So, orbitals involved are s, p x, p y, p z , d z 2 Now again count the total valence electrons used in the above structure. Polarity Of Water. Your email address will not be published. If we know the molecular geometry of a molecule. following Molecular geometry Electron domain geometry Hybridization Bond angle Domain 4 Geometry Answers Angle Pairs April 26th, 2018 - Browse and Read Domain 4 Geometry Answers Angle . Hybridization of SF2 Let's find the hybridization of SF2 through the steric number of its central atom. Or, we can say they are those electrons which are left after the octet completion criteria are fulfilled. As the Molecular Geometry and the shape of compounds are determined by Lewis structure by comparing the arrangements of given atoms and their electrons in the valence shells. This intermixing usually results in the formation of hybrid orbitals having entirely different energies, shapes, etc. According to VSEPR theory, each atom in a compound is arranged in a way that the compound becomes stable in nature. Step 3. A chemical bond is formed between them. Draw the molecule by. What is the approximate bond angle in SF2? Hence, SF2 is a polar molecule and also contributes some dipole moments. In this blog post, we will look at the Lewis dot structure of SF2, its molecular geometry and shape. What is the hybridization of the central atom? 4. In the case of SF2 Lewis structure, the steric number is = 2 + 2 = 4. What are the requirements for atomic orbitals to undergo hybridization? Clustered regularly interspaced short palindromic repeats (CRISPR) and their associated proteins (Cas) are promising molecular diagnostic tools for rapidly and precisely elucidating the structure and function of genomes due to their high specificity, programmability, and multi-system compatibility in nucleic acid recognition. Sulfur Difluoride (SF2) is an inorganic molecule. sulfur has less electronegative value than fluorine. (iii) Its aqueous solution turns blue litmus to red. 3. Similarly fluorine (Atomic number = 9 and electronic configuration = 2,7) have 7 valence electrons. The two lone pairs of electrons push the Fluorine atoms downwards due to the repulsive forces, and as a result, the shape of this molecule is bent. The hybridization of SF2 In SF2 the sulfur in the middle has SP3 hybridization. Sulfur is bonded to two fluorine atoms, and has two lone pairs. These configurations are decided on the basis of the number of electrons these elements have. Sf2 Molecular Geometry, Lewis Structure, Polarity and Bond Angles. The formula used to calculate formal charge is: FC of fluorine in SF2 lewis structure = 7 6 2/2 = 0, FC of sulphur in SF2 lewis structure = 6 4 4/2 = 0. The charge appears on an atom due to the electronegativity difference. This is known as the octet rule. The molecular geometry of any compound is understood to know about the structure of the compound and how it appears in a plane. So, there is no need for special handling while using it. Here, if we look at the Sulphur atom, it is bonded with two atoms and has two electrons pairs. Identify the molecular geometry of SF2. 5. Total number of valence electrons for SF2 Valence electrons of Sulphur + Valence electrons of Fluorine. Used as targets and substrates in the development of new synthetic methods. Hybridization in SF 2: It has long been known that sulfur can make multiple bonds to atoms that exceed the expected bonding when considering its ground state electron configuration. As SF2 contains 2 fluorine atoms. During this process, the wavefunctions, of atomic orbitals of same atom are combined to give new wavefunctions corresponding to hybrid orbitals. As in the shown figure, we draw the single bond from the left and right side fluorine atoms to the central atom. Steric number = Lone pair on central atom + no. Calculate the formal charge distribution on all atoms and check the stability. Polarity is defined as the distribution of charge over the atom joined by a bond within a molecule. Another way of finding the hybridization of SF2 is by calculating the steric number of SF2, which we can find by the following equation. Hy of SF2 = the number of hybridizations of SF2 Number of S-F bonds = N.A (S-F bonds) Lone pair on the central sulfur atom = L.P (S) Calculation for hybridization number for SF2 molecule SF2 lewis structure involves 1 sulphur and 2 fluorine atoms. So, it is considered as lone pairs or unbonded electrons. It consists of one Sulphur atom and two Fluorine atoms. Bonding pairs are the pair of electrons that are in a bond. has a simple Lewis structure in which the Sulphur atom is in the centre forming single bonds with both the Fluorine atoms. Apart from this, not much is known about the SF2 lewis structure due to its instability. arrow_forward. Lone pairs are those represented as dots in the lewis diagram that do not take part in the formation of bonds and are also called nonbonding electrons. Circle the electrons involved in bonding. Sulfur difluoride, SF2 is an inorganic compound that consists of one sulfur and two fluorine atoms. The sp 2 hybridization is the mixing of one s and two p atomic orbitals, which involves the promotion of one electron in the s orbital to one of the 2p atomic orbitals. So, in the Sf2 molecule, the electronegativity of sulfur is 2.58 and the electronegativity of fluorine is 3.98. As far as SF2 lewis structure is concerned the central sulphur atom has 2 lone pairs of electrons and 2 bond pairs with fluorine atoms. The hybridization of the central atom which is sulphur is Sp3. Hence, SF2 is a bent-shaped molecule due to the presence of lone pairs on the Sulphur atom. Thus, the bond will be polar as the electronegativity difference is greater than 0.4. Study with Quizlet and memorize flashcards containing terms like or a molecule with the formula AB2 the molecular shape is _____, According to VSEPR theory, if there are five electron domains in the valence shell of an atom, they 2) will be arranged in a(n) _____ geometry., According to VSEPR theory, if there are four electron domains in the valence shell of an atom, they will be arranged in a . So it will be the central atom. So, SF2 has sp3 hybridization. Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. This explains the Lewis structure of SF2, how the bonds are made, and how many lone pairs of electrons are there. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. With the help of this diagram, we can showcase the energy that different energy orbital acquires and have. Your email address will not be published. Lewis Structure is the pictorial representation of the arrangement of valence electrons around the individual atoms in the molecule. The Atomic Number of sulfur is= 6, You can see in the image; that sulfur has 6 valence electrons. If we take the plane in xy direction, then only one orbital is there which can form bonds perpendicular to it and it is d z 2 as it is along the z-axis. COOLAIR shows variable temperature sensitivity and is highly up-regulated by freezing temperatures . From the periodic table, we know that the valance electron of sulfur is 6. The direction of the dipole moment will be from the Sulphur atom towards the Fluorine atom, as here Fluorine will try to pull the shared electrons to itself. Her specialties include creative writing, Seo content, blog post, and product description. Similarly, if the valence electrons of a given molecule are more than 56, divided by 18. SF2 is a synthetic fiber and fluid road stabilization system that improves compressive strength, CBR, cut resistance, and adhesion of the material. XeF2 Molecular Geometry And Bond Angles XeF2 molecular geometry is linear. When we compare the electronegativity difference of Sulphur and Fluorine the value of electronegativity of Sulphur is 2.58 and for Fluorine is 3.98. Required fields are marked *. analyzed the sensing performance in the THz waveband of a . Sulfur difluoride is formed by the reaction between one mole of sulfur dichloride with 2 moles of potassium fluoride. The molecular geometry of SF2 is Bent. So the total number of valence electrons participating in bonding is 6 + 72 = 20. Techiescientist is a Science Blog for students, parents, and teachers. The compound is Polar in nature because the dipole moment between the Sulfur and Fluorine doesnt cancel each other. We aim to make complex subjects, like chemistry, approachable and enjoyable for everyone. As per the lewis structure of SF2, the sulfur atom is bonded with two fluorine atoms and it contains two lone pairs of electrons. Check Explanation. SF2 molecule contains the AX2E2 type of notation. The electronic configuration of Sulfur is 1s2 2s2 2p6 3s2 3p4. The SF2 hybridization is sp3 hybridization. What are the electron and molecular geometry of SF2? So in the Lewis Structure of SF2, there are single bonds between Sulphur and Fluorine atoms with two lone pairs of electrons on the central Sulphur atom. The hybrid orbitals are higher in energy than the s . Here's a recent and arguably more understandable reference: J. Chem. Due to which there are repulsions and these repulsive forces lead to bent geometry. The angle that forms in SF2 is around 98 degrees.Both Fluorine atoms are pushed downwards by two lone pairs present on the sulfur atom, therefore, the bond angle varies between180 degrees to 98 degrees. SF2 has Sulfur as its central atom with two neighboring atoms of Fluorine. The best way to find the valence electron in an atom is by looking at the group number in the periodic table. Thus, here 4 deduce that four energy levels are going to be utilized. yes SF2 is polar What type of bond is SF2?. Hence, sulfur needs only 4 more electrons to complete its octet. Here, if we look at the Sulphur atom, it is bonded with two atoms and has two electrons pairs. There are two lone pairs of electrons on the Sulphur atom which makes the geometry of the molecule bent. In this step, we have to complete the octet of outer atoms first, the octet means having 8 electrons in the valence shell of an atom. In the lewis structure of SF2, we can notice single bonds between sulfur and fluorine that left out two lone pairs of electrons on the central sulfur atom. And the compound also has a bent molecular geometry shape. Array-comparative genomic hybridization analysis (aCGH) was performed for individual 6 with a 44K whole-genome . The elemental analysis of SF2 lewis structure shows that the fluorine atom is in dominance with 54.23% contribution and the sulphur atom has 45.77% contribution. Every atom needs to fill its outer shell to become stable. Sulfur Difluoride is an inorganic molecule made up of one Sulphur atom and two Fluorine atoms. [Quick overview], Is SiCl2F2 Polar or Nonpolar? See Answer Question: Draw the Lewis structure of SF2 showing all lone pairs. The element is stable if there is the presence of 8 electrons in the valence shell. According to that Lewiss structure of SF2 has four (4) hybrid orbitals. Lewis Structure is nothing but an arrangement of valence electrons between different atoms. Lecture 15 Generation of acetyl-CoA Module 4 March 15-26, 2021 Lecture goals Successful students will be able to: L. Arkansas State University Organizational Structure and Cole Values Discussion. 2 lone pairs on the sulfur central atom. Can you please say this is planar or not?? Steric number = Lone pair on central atom + no. Hybridization of Sulfur Difluoride (SF2) Lewis dot structure of SF2 molecule consists of one sulfur atom and two fluorine atoms. molecule consists of one sulfur atom and two fluorine atoms. As far as SF2 lewis structure is concerned then there is sharing of electrons as both the elements are non-metals. Valence Bond Theory Vbt. The valence electrons of SF2 are 20 and sulfur is less electronegativity than fluorine. Also used as an electrophilic warhead by both medicinal chemists and chemical biologists. . SF2 is polar because of its bent geometrical shape and large electronegativity difference between sulfur and a fluorine atom. As the atoms involved are non-metals in the composition of SF2 lewis structure so there is sharing of electrons instead of gaining or losing electrons. Article. 5.2C: sp2 Hybridization. Hybridization is the concept of knowing and identifying that how many electrons are there in the different energy orbital. So we will first find out the total valence electrons for Sulphur Difluoride. As these lone pairs try to keep their repulsive forces minimal, they push down the Fluorine atoms. Draw the Lewis dot structure for the molecule. Draw a three-dimensional sketch of the molecule and show orbital overlap. SCl2 + HgF2 -> SF2 + HgCl2. Now count the valence used in the above structure. SF2 hybridization is a process in which two SF2 molecules combine to form a new hybrid Hybridization is the notion of determining and recognising the number of electrons present in various energy orbitals. In this way, fluorine atoms form a single bond with sulfur. But mostly, it is important to consider both the number of atoms as well as the electronegativity of atoms to determine which one to take the central atom. The valence electrons of SF2 are the sum of the valence electrons of sulfur and fluorine. Every number represents one energy orbital. One pair of electron sharing means that only a single bond is formed between Sulfur and two atoms of Fluorine each. The ground. The AXE notation is used to determine the molecular geometry of a molecule. Save my name, email, and website in this browser for the next time I comment. And due to this vast difference in electronegativity, there will be a dipole moment between Sulphur and Fluorine atoms. Hybridization in Chemistry is defined as the concept of mixing two atomic orbitals to give rise to a new type of hybridized orbitals. DPP(1 - ) FOR 13TH IC - Free download as PDF File (.pdf), Text File (.txt) or read online for free. And Sulfur atom has four valence electrons that do not participate in bond formation and hence it is called lone pair or nonbonding pair of electrons. Is sf2 polar? To find out the Hybridization of this molecule, we will consider the two numbers of atoms and the total number of lone electron pairs bonded to the molecule. Moving ahead lets discuss the properties related to the SF2 lewis structure. arrow_forward. It has a chemical formula of SF, and can be generated by the reaction of Sulphur Dioxide and Potassium Fluoride or Mercury Fluoride. SF2 molecule has three atoms, i.e., one sulfur and two fluorine atoms. We access the lone pairs on the atom, the shape, and other things while finding the polarity of a compound. As discussed in Chapter 6.2, the hybridization on the B atom is sp2 and the shape of the orbitals is triangonal planar. The ideal angle for a tetrahedron is 109.5 deg. The hybridization of this compound is sp3 and the molecular geometry is bent or non-linear in nature. Article. It is also used as electrophilic warheads by both medicinal chemists and chemical biologists. First, we will have to calculate the total number of valence electrons in this compound. And sulfur has four electrons that dont take part in any bond formation. Indeed, oxygen can only bond with fluorine to form oxygen difluoride, "OF"_2. Hence, the outermost shell of an atom is called the valence shell and its corresponding electrons are called valence electrons. A single bond has one bond pair means 2 bonding electrons. Lewis structure is also called dot and cross structure. There are in total 2 atoms of Fluorine in this compound. In CH 2 O, the C atom is sp 2 hybridized, meaning the C = O bond is formed by an overlapping sp 2 orbital from C and an sp 2 orbital from O (since O is sp 2 hybridized) for the bond and an overlapping p orbital from C and a p orbital from O for the bond. We have used only 16 electrons. Draw a Lewis structure; fill in any nonbonding electrons for [N3]- (azide ion). So a total of 16 valence electrons are used. So, Sulphur Difluoride has a total of 20 valence electrons. Lewis structure is the pictorial representation of bond formation in a molecule. For drawing the Lewis structure for any molecule, we first need to know the total number of valence electrons. They have a very important role when it comes to finding shape or other properties. In the very first step, we have to count the number of valence electrons available for drawing the Lewis structure of SF2. The Lewis dot structure of Sulfur Difluoride (SF2) contains two single bonds. C2H4 Lewis Structure, Molecular Geometry, Hybridization, and MO Diagram, SO42 Lewis Structure, Molecular Geometry, Hybridization, and Polarity. SF2 Molecular Geometry, Bond Angles (and Electron Geometry) Wayne Breslyn 636K subscribers Subscribe 16K views 2 years ago An explanation of the molecular geometry for the SF2 (Sulfur. Required fields are marked *. Or simply, we can predict the hybridization of any compound from the given steps: 1. Thus, the molecule has a non-zero net dipole moment, makingSF2a polar molecule. We aim to make complex subjects, like chemistry, approachable and enjoyable for everyone. Hey folks, this is me, Priyanka, writer at Geometry of Molecules where I want to make Chemistry easy to learn and quick to understand. With a molar mass of 70.062 g/mol, this compound is made up of one Sulfur atom and two Fluoride atoms.This compound is formed when sulfur dichloride reacts at low pressure with either potassium fluoride or mercury (||) fluoride.SCl2 + 2KF ->. SF2 has Sulfur as its central atom with two neighboring atoms of Fluorine. Here, if we look at the Sulphur atom, it is bonded with two atoms and has two electrons pairs. The sulfur atom has two bonding pairs of. So, just start putting the remaining valence electron on fluorine atoms till they complete their octet. Now just check the formal charge for the above SF2 lewis structure. This shows that all these atoms are chemically joined with each other in the Sulfur Difluoride (SF2) molecule. Now you have to complete the octet of fluorine by putting three lone pairs on each fluorine atom. It is important to know about the polarity of any compound because by knowing about the polarity we come to know that whether the compound has a negative or positive charge. No, SF2 hsd bent shape as there are two atoms bonded to the central atom as well as there are two lone pairs in it. After identifying the central atom and drawing a skeleton diagram, It became easy to point out the lone pairs of electrons on each atom. With a molar mass of 70.062 g/mol, this compound is made up of one Sulfur atom and two Fluoride atoms. Im a mother of two crazy kids and a science lover with a passion for sharing the wonders of our universe. This shape is decided on the basis of different factors like lone pairs of electrons, bonding electrons, etc. fluorescent in situ hybridization (FISH) a genetic mapping technique using fluorescent tags for analysis of chromosomal aberrations and genetic abnormalities. This compound is formed when sulfur dichloride reacts at low pressure with either potassium fluoride or mercury (||) fluoride. Valance shell electron pair repulsion theory is used to determine the molecular geometry of a molecule. . And so on. SN = 4, bent Upvote 1 Downvote Add comment Report Still looking for help? Thus, it is stable. Now the SF2 molecule has the following structure. In the Sulfur Difluoride (SF2) molecule, each bond pair represent a bond. The repulsion between the atoms and their corresponding electrons should be minimum and to achieve that a compound takes a unique shape.

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