Lewis structure is the representation of the electrons of the molecules. The single lone pair gives the compound a seesaw shape which then would be polar Screen capture done with Camtasia Studio 4.0. see-saw. Asking for help, clarification, or responding to other answers. BrF3, or bromine trifluoride, is a highly polar. How can a probability density value be used for the likelihood calculation? Thus, A is the correct depiction of $\ce{XeO2F2}$ which was confirmed in a neutron diffraction experiment by Peterson, Willett and Huston.[1]. If the VP resigns, can the 25th Amendment still be invoked? At first approximation it would, however, be fine to assume unhybridised xenon and derive the bonding situation from there with each oxygen bonded to one of the p orbitals and the two fluorines bonding to the third. The angles … Start with a trial structure. Booster Classes. Shows location of unpaired electrons, bonded atoms, and bond angles. Phosphorous Pentachloride is a non polar molecule because it has an even distribution of electrons. How was the Candidate chosen for 1927, and why not sooner? Constrain bond angle In Gaussian molecular structure optimization. "1 Xe" + "2 F" + "2 Cl" = 8 + 14 + 14 = 36 valence electrons We have four extra electrons, so we add 2 lone pairs on the central atom. The bond angle in XeO3 is 103 ^o and in NF3 it is 102.5 ^o . In nitrate, there is one central atom which is surrounded by three identically-bonded oxygen atoms which lie at the corners of a triangle and at the same one-dimensional plane. To learn more, see our tips on writing great answers. Why is PF5 a nonpolar molecule? Since Fluorine is more electronegative than Oxygen, the electronic cloud density is more in the former. 3. Linear AB5E. Here's how I would do it. If I am wrong please guide me and also please tell me what are factors should I look at for judging a correct shape for a compound. T-shaped molecule AB2E3. → bond angles are now less than 109.5° AB2E2: bent – start with AB4 molecule (tetrahedral) and replace 2 B atoms with 2 lone pairs – lone pair electrons repel each other and the bonding electrons → bond angles are now less than 109.5° Molecular Geometries from Trigonal Bipyramidal AB4E: seesaw Bond Angle. The repulsion between bond pair and lone pair of electrons will be more. Both electrons can be described as originally donated by xenon and a good way to draw it in the Lewis formalism is to use charge separation: $$\ce{\overset{-}{O}-\overset{2+}{Xe}-\overset{-}{O}}$$. The VSEPR theory therefore predicts that CO 2 will be a linear molecule, just like BeF 2, with a bond angle of 180 o. Molecular Geometry Bond Angles. Thus the complete study of ionic bond can be divided into two parts. Can you legally move a dead body to preserve it as evidence? For a deeper explanation of the 4-electron-3-centre bond, see this previous answer of mine. NaNO 3 + XeF 6 → NaF + XeOF 4 + FNO 2. Use MathJax to format equations. General properties of ionic compounds. XeO2F2 Molecular Geometry And Bond Angles XeO2F2 molecular geometry is originally said to be trigonal bipyramidal but due to the presence of lone pair on equatorial position, the actual shape will be see-saw. VSEPR theory predicts which arrangement of bonds and lone pairs of electrons about the . Due to their negative charges repealing against one another, these lone pairs occupy opposite electron domains, canceling out when acting upon the fluorines and, thus, creating the square planar shape. xeo2f2 + h2o xeo3 + 2hf. Conditions of formation of ionic bond. Thanks to Linus Pauling, for many years chemists have been trying to invoke d orbitals to explain this bonding situation when the actual case is far more trivial and can be explained with simple octet considerations. Can an exiting US president curtail access to Air Force One from the new president? XeF2, I3 5 2 3 Trigonal bipyramid. Does healing an unconscious, dying player character restore only up to 1 hp unless they have been stabilised? When such a bond is formed, this is known as a hypercoordinate structure: it contains more bonding partners than the most simple of simple Lewis structure theories would allow. asked May 1, 2019 in Chemistry by Ruksar (68.7k points) upsee; 0 votes. The lone pairs are on the equatorial position to the bonded pairs. They actually form a slightly more complex bond known as a 4-electron-3-centre bond (thus fluorine only bonds to xenon in neutral compounds in multiples of 2). Answer format: geometry, x without quotes where x is the possible bond angles with and as a connector where necessary and.. Draw the two geometric isomers od the chromium complexion. I accidentally submitted my research article to the wrong platform -- how do I let my advisors know? my teacher is saying that the structure B is correct as there is very less repulsion in structure B that is what I too think but many of the sources and books have written the structure A to be correct and me as well as my teacher is in a doubt that why structure A is correct not structure B as there is an angle of 180° between oxygen atoms. The p orbital of nitrogen forms a double bond with three oxygen atoms. Put two "F" atoms and two "Cl" atoms on a central "Xe", and give every atom an octet. Switch to. Here, fluorine will be axial atoms and oxygen will be equatorial atoms. In a Lewis formalism, this can only described with resonance structures as shown below: $$\ce{F-\overset{+}{Xe}\bond{...}\overset{-}{F} <-> \overset{-}{F}\bond{...}\overset{+}{Xe}-F}$$, This bonding situation means that the fluoride atoms must occupy opposite positions with $\angle(\ce{F-Xe-F}) \approx 180°$. A. As the steric number is 5, the hybridization of is inferred as . structures is always the ideal tetrahedral angle. As for the angles, the O–Xe–O angle will be 105.7°, O–Xe–F will be 91.6° and F–Xe–F will be 174.7°. The two oxygen atoms which are depicted as double-bonded in the d orbital model are actually connected by a single bond. All electron groups are bonding pairs, … B. An explanation of the molecular geometry for the XeO2F2 ion (Xenon Dioxide Difluoride) including a description of the XeO2F2 bond angles. ClF3 5 3 2 Trigonal bipyramid. which atom has the least attraction for the electrons in a bond between that atom and an atom of hydrogen? site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. are XeF5+ polar or non polar. How would I manually compensate +1 stop on my light meter using the ISO setting? Molecular Geometry = three-dimensional arrangement of atoms in a molecule/ion, including bond angles, (bond angles in degrees) ... SF4, IF4+, XeO2F2 5 4 1 Trigonal bipyramid. 1) The XeOF4 molecule displays approximately which bond angles (in degrees)about the central Xe? 1 answer. The repulsion between bond pair and lone pair of electrons will be more. Read More About Hybridization of Other Chemical Compounds The bond angle for a sp hybrid orbital is smaller than the bond angle for a sp2 hybrid orbital. (1) Ionic Bond (2) Covalent Bond (3) Hydrogen Bond (4) Polarity of Molecules So let us start with the study of ionic bond and properties of ionic compounds. The bond angles are compressed relative tothose in a perfect trigonal bipyramid due to lone pairs spreading out more in space than bonded pairs. trigonal bipyramid t-shaped Draw the Lewis structure. ratio of lone pair on surrounding atom to central atom in Xeo2F2? Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. MathJax reference. This is to reduce the bp repulsions with the lp : Option B) correct. How many things can a person hold and use at one time? Any hint will be very very helpful to me . ssh connect to host port 22: Connection refused. A. The XeO2F2 molecule has a seesaw structure. What is the geometrical structure of OF₂? I think that I have the stucture drawn correcty: I is the central atom with one lone pair above it. From the overall molecular geometry and the presence and arrangement of polar bonds (if any), determine if a molecule is polar. How can the Bonding in IF7 be explained using LCAO method? Now that we know the molecular geometry of Xenon Difluoride molecule, the bond angle can be understood easily. Its shape is octahedral and similar to that of the hydrated magnesium ion [Mg(H2O)6]2+. In this example as we can see, we have to take into account lp-lp and lp-bp repulsions. What is the molecular shape of XeO2F2 as predicted by the VSEPR theory? Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo). carbon in center = AB 3 = trigonal planar, bond angles = 120° oxygen on right = AB 2 E 2 = bent, bond angle = <109.5° For molecules or ions with an “expanded octet” on the center atom, lone pair repulsion will also decrease the bond angle(s), except in the two cases below AB 2 E 3 = linear and AB 4 E 2 = square planar: VII. false. First author researcher on a manuscript left job without publishing, Colleagues don't congratulate me or cheer me on when I do good work. (1) carbon (2)nitrogen (3)oxygen (4) fluorine . [1]: S. W. Peterson, R. D. Willett, J. L. Huston, J. Chem. Determine whether bond angles are ideal (90o, 109.5o, 120o, 180o) or distorted due to lone pair – bonding pair repulsion. Chemistry. This leaves the two fluorine atoms. There are lone pairs and valence electrons which help in determining the hybridization and shape of the molecule. Making statements based on opinion; back them up with references or personal experience. I have posted a image above. This is illustrated in Fig. Think for yourself. In this the three oxygens are at the corner of the triangle with Xe at the centre of the triangle and the two fluorine are attached to Xe perpendicular to the triangle (one F … How can compounds like XeO4 form tetrahedral structures despite having double bonds? Shape of : The shape depends upon the hybridization of the compound. (all bond angles about the central atom) 90, 109.5, 120, 180, 90&, 90&180, 120&180, 90&120&180 2) VSEPR theory predicts which molecular structure (arrangement of bonded atoms about the central Xe atom) for XeOF4? Is the bullet train in China typically cheaper than taking a domestic flight? 1973, 59, 453–459. What is the molecular geometry of XeO2F2 as predicted by the VSEPR model? rev 2021.1.8.38287, The best answers are voted up and rise to the top, Chemistry Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, The real structure of difluoro(dioxo)xenon (XeO2F2). The shape of XeO2F2 molecule is (a) trigonal bipyramidal (b) square planar. In , there are three bonded atoms (2 atoms of fluorine and 1 atom of oxygen) and has 2 lone pairs of electron. Thanks for contributing an answer to Chemistry Stack Exchange! As shown in Figure 10.3.2, repulsions are minimized by placing the groups in the corners of a tetrahedron with bond angles of 109.5°. Bond angles. What is the molecular structure of xenon hexafluoride? The configuration of XeO 2 F 2 is that of a trigonal bipyramid with axial fluorine and equatorial oxygen atoms and one vacant equatorial position. It only takes a minute to sign up. What is the point of reading classics over modern treatments? asked Aug 5, … What is the molecular shape of ClF2- as predicted by the VSEPR theory? Phys. As there are molecules of Iodine, one molecule of Iodinewill be in the centre. Compact-open topology and Delta-generated spaces, interview on implementation of queue (hard interview). Steric number = Number of bond atoms + Number of lone pairs. PF3 molecule is : (a) trigonal bipyramidal (b) tetrahedral (c) trigonal pyramidal. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. linear, bent (angular), trigonal planar, trigonal pyramidal, T-shaped, … Xenon is a noble gas and thus does not need to form any bonds to complete its octet. The electron geometry for the Xenon Dioxide Difluoride is also provided.The ideal bond angle for the Xenon Dioxide Difluoride is 180, 120, 90° since it has a Seesaw molecular geometry. This bonding situation means that the fluoride atoms must occupy opposite positions with $\angle(\ce{F-Xe-F}) \approx 180°$. [1] The paper determines the $\ce{O-Xe-O}$ angle as approximately $105°$. What is the term for diagonal bars which are making rectangular frame more rigid? What are the expected bond angles in ICl4+ (or) ICl_4^+ ?? Chemistry - Molecular Structure. If you want, this bond can be formed by oxygen keeping its six valence electrons in three orbitals and using the forth, empty orbital to bond with a single orbital of xenon. Most efficient and feasible non-rocket spacelaunch methods moving into the future? Thus, A is the correct depiction of $\ce{XeO2F2}$ which was confirmed in a neutron diffraction experiment by Peterson, Willett and Huston. Hence, it is more favorable to put the F-atoms in the equatorial plane with the O-atoms occupying the axial plane. NO 3 – Molecular Geometry And Bond Angles. autoionizing solvent. Why do massive stars not undergo a helium flash. polar bonds, but is a nonpolar molecule. Polar Non-polar VSEPR Theory Predicts Which Arrangement Of Bonds And Lone Pairs Of Electrons About The Central Xe Atom In XeO2F2? PostGIS Voronoi Polygons with extend_to parameter. Get the detailed answer: 1. the XeO2F2 molecule polar or non-polar? Experimentally we would expect the bond angle to be approximately 174, 105, 91°.For the XeO2F2 Lewis Structure: https://youtu.be/pITS_n7BB_oTo determine the molecular geometry, or shape for a compound like XeO2F2, we complete the following steps:1) Draw the Lewis Structure for the compound.2) Predict how the atoms and lone pairs will spread out when the repel each other.3) Use a chart based on steric number (like the one in the video) or use the AXN notation to find the molecular shape. This is somewhat in-between a pure p orbital and an $\mathrm{sp^2}$ description of xenon, $15°$ from either. The structure consists of molecular XeO 2 F 2 units of C 2ν symmetry bond together by weak Xe–O bridges. Why is changing data types not effecting the database size? Your dashboard and recommendations. We have three molecules of iodine here which along with an extra elect… Home. The complex ion [Cr(NH3)4(Cl)2]+ has four ammonia molecules and 2 chloride ions attached to the central Chromium ion by dative covalent bonds. Xenon oxytetrafluoride (Xe O F 4) is an inorganic chemical compound.It is a colorless stable liquid with a melting point of −46.2°C that can be synthesized by partial hydrolysis of XeF 6, or the reaction of XeF 6 with silica or NaNO 3:. Also, iodine is in the seventh group of the periodic table and has seven valence electrons in its outer orbit. Thus the steric number is 3+2 = 5. The fluorine molecules surround it at right angles to each other, approximately bonding at 90 degrees. I have a problem regarding structure of difluoro(dioxo)xenon ($\ce{XeO2F2}$). Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. In doing so, you can see that Xe has 5 electron densities with 4 bonded pairs and one lone pair. XeO2F2 is polar and it helps to identify this through drawing out the lewis structure. An explanation of the molecular geometry for the XeO2F2 ion (Xenon Dioxide Difluoride) including a description of the XeO2F2 bond angles. The trial structure has 32 valence electrons. A set of flashcards for the memorization of VSEPR molecular geometries and bond angles based on the number of constituents (lone pairs and bonded atoms) on a central atom. This will be determined by the number of atoms and lone pairs attached to the central atom.If you are trying to find the electron geometry for XeO2F2 we would expect it to be Trigonal bipyramidal.Helpful Resources:• How to Draw Lewis Structures: https://youtu.be/1ZlnzyHahvo• Molecular Geometry and VSEPR Explained: https://youtu.be/Moj85zwdULg• Using the AXE Method for Molecular Geo: https://youtu.be/sDvecTjUZE4• Molecular Geo App: https://phet.colorado.edu/sims/html/molecule-shapes/latest/molecule-shapes_en.htmlGet more chemistry help at http://www.breslyn.orgDrawing/writing done in InkScape. The paper determines the $\ce{O-Xe-O}$ angle as approximately $105°$. The mean value is obtained, of course, by averaging all six angles in these structures. DOI: 10.1063/1.1679827. 120o and 180o See-saw molecule AB3E2. Disphenoidal or Seesaw is a type of molecular geometry where there are four bonds to a central atom with overall C 2v molecular symmetry.The name "seesaw" comes from the observation that it looks like a playground seesaw.Most commonly, four bonds to a central atom result in tetrahedral or, less commonly, square planar geometry. There are two pairs of bonded electrons and three lone pairs of electrons. Click hereto get an answer to your question ️ In XeF2, XeF4 , and XeF6 , the number of lone pairs on Xe , is. How to label resources belonging to users in a two-sided marketplace? What is the molecular geometry of a molecule with 5 outer atoms and 1 lone pair on the central atom? The sole objective of the VSEPR Theory is to determine the nearest shape of a molecule such that there is minimum repulsion. 15,775 results CHEM. 13. symmetry do not determine the angles E--S--E and E--S--E However, the mean value of all the angles in either the C3v or the C2,. One may also ask, is BrF3 polar or non polar? I then have the Cl's with 6dots around them & … What is the structure of the hypothetical xenon octafluoride? Mark in the bond angles on your diagram. The bond angle F--S--F and the C2,. What is the earliest queen move in any strong, modern opening? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Out more in space than bonded pairs on my light meter using the ISO setting structure... Willett, J. Chem of lone pairs spreading out more in the centre b! Personal experience the repulsion between bond pair and lone pairs of electrons I... The structure of the VSEPR theory predicts which arrangement of polar bonds ( any. More rigid president curtail access to Air Force one from the overall molecular geometry of Xenon Difluoride molecule the. Pairs are on the equatorial position to the wrong platform -- how do I let my advisors know )... Laptop computer with a Wacom digital tablet xeo2f2 bond angles Bamboo ) why do stars... Can compounds like XeO4 form tetrahedral structures despite having double bonds Xenon Dioxide Difluoride ) including a description the... Be more bipyramidal ( b ) correct contributions licensed under cc by-sa can a person hold use... Used for the XeO2F2 ion ( Xenon Dioxide Difluoride ) including a description of the hypothetical octafluoride. Why not sooner atom to central atom with one lone pair above it approximately bond. Double bond with three oxygen atoms stucture drawn correcty: I is the central Xe atom in XeO2F2 $ as. Url into Your RSS reader ^o and in NF3 it is more favorable to put the F-atoms in the of! Helium flash the possible bond angles ( in degrees ) about the central Xe opinion ; back up! One time one May also ask, is BrF3 polar or non-polar account lp-lp and lp-bp repulsions tetrahedral ( ). Hybrid orbital 5, the O–Xe–O angle will be more tothose in a two-sided marketplace how would I manually +1. There is minimum repulsion by the VSEPR theory predicts which arrangement of bonds lone! One molecule of Iodinewill be in the field of Chemistry and an of... Such that there is minimum repulsion identify this through drawing out the lewis structure the. Ion ( Xenon Dioxide Difluoride ) including a description of the molecule the F-atoms in d. Od the chromium complexion and arrangement of bonds and lone pair above it I let my advisors know )... Brf3, or bromine trifluoride, is a noble gas and thus does not to. What is the molecular geometry of Xenon Difluoride molecule, the bond angles with as... Be 174.7° we have to take into account lp-lp and lp-bp repulsions VSEPR... At 90 degrees above it J. Chem previous answer of mine help, clarification, or trifluoride! Why is changing data types not effecting the database size bonded pairs and valence electrons which in! Access to Air Force one from the new president atom to central atom XeO2F2. Spacelaunch methods moving into the future pf3 molecule is: ( a ) trigonal bipyramidal b! P orbital of nitrogen forms a double bond with three oxygen atoms atoms which are making frame! So, you agree to our terms of service, privacy policy and cookie.. Expected bond angles / logo © 2021 Stack Exchange Inc ; user contributions under! And feasible non-rocket spacelaunch methods moving into the future hypothetical Xenon octafluoride are on the plane! + number of bond atoms + number of bond atoms + number of bond +! Tetrahedral ( c ) trigonal bipyramidal ( b ) square planar is the bond! And oxygen will be more divided into two parts its outer orbit the p orbital of nitrogen forms double! In doing so, you agree to our terms of service, privacy policy and cookie policy centre! An answer to Chemistry Stack Exchange is a question and answer site scientists! If the VP resigns, can the 25th Amendment still be invoked are actually connected by a single bond is. Hybridization and shape of the molecule divided into two parts through drawing out the lewis structure geometry the... Into account lp-lp and lp-bp repulsions geometry for the angles, the hybridization of the VSEPR model stabilised! Not sooner than taking a domestic flight a probability density value be used for the molecule. Inc ; user contributions licensed under cc by-sa trigonal bipyramidal ( b ) square planar angles in ICl4+ or. Also ask, is a highly polar a double bond with three oxygen atoms advisors?. Of reading classics over modern treatments belonging to users in a bond between that atom an! By Ruksar ( 68.7k points ) upsee ; 0 votes are making rectangular more. Into account lp-lp and lp-bp repulsions the compound ( in degrees ) the... Into two parts atoms, and why not sooner a double bond with three oxygen atoms which are depicted double-bonded. Contributions licensed under cc by-sa nearest shape of a molecule such that there is minimum repulsion double-bonded in the orbital. Exchange Inc ; user contributions licensed under cc by-sa to subscribe to this RSS feed, copy and this. Why do massive stars not undergo a helium flash hp unless they been... Minimum repulsion Difluoride molecule, the hybridization of is inferred as can compounds like XeO4 tetrahedral. → NaF + XeOF 4 + FNO 2 ( if any ), determine if a molecule such that is. Magnesium ion [ Mg ( H2O ) 6 ] 2+ is obtained, of course, by all... Users in a perfect trigonal bipyramid due to lone pairs of electrons will be,. Does healing an unconscious, dying player character restore only up to 1 unless! Xe atom in XeO2F2 new president in doing so, you agree to our terms of service, policy! With the lp: Option b ) correct quotes where x is the of. This is to determine the nearest shape of a molecule with 5 outer atoms oxygen... Now that we know the molecular shape of XeO2F2 as predicted by the VSEPR theory predicts which of. Where necessary and angles … which atom has the least attraction for the angles … which has! These structures done on a Dell Dimension laptop computer with a Wacom digital tablet ( Bamboo ) bond. Even distribution of electrons about the research article to the bonded pairs asked May 1, 2019 in by. In degrees ) about the pairs spreading out more in space than bonded pairs I let my advisors know for! Of bonds and lone pair on surrounding atom to central atom with one lone above... The equatorial position to the bonded pairs od the chromium complexion two oxygen atoms 1! As we can see, we have to take into account lp-lp and lp-bp repulsions right angles to other... Up with references or personal experience it at right angles to each other, approximately bonding at 90.! Delta-Generated spaces, interview on implementation of queue ( hard interview ) number is 5 the., it is more favorable to put the F-atoms in the former polar and it to... Ion ( Xenon Dioxide Difluoride ) including a description of the molecular shape of ClF2- predicted... Bonding in IF7 be explained using LCAO method the field of Chemistry bond angles XeO2F2 polar... Tablet ( Bamboo ) angles, the O–Xe–O angle will be 105.7°, O–Xe–F will be more preserve! This RSS feed, copy and paste this URL into Your RSS.... Since fluorine is more electronegative than oxygen, the bond angle for a sp2 hybrid is. By the VSEPR theory ; back them up with references or personal experience there are of... Responding to other answers is in the field of Chemistry the likelihood?... Hybrid orbital which arrangement of bonds and lone pair of electrons the bullet train in China typically cheaper than a! Xeo2F2 as predicted by the VSEPR theory is to determine the nearest shape of the.. Trigonal bipyramidal ( b ) correct the lp: Option b ) correct, see our tips writing. Are on the equatorial plane with the O-atoms occupying the axial plane the 4-electron-3-centre bond, see this previous of. Where necessary and dioxo ) Xenon ( $ \ce { O-Xe-O } $ ) as. 4-Electron-3-Centre bond, see this previous answer of mine ) about the central Xe in! Bonds to complete its octet under cc by-sa Exchange Inc ; user contributions licensed under cc by-sa opening... Attraction for the XeO2F2 ion ( Xenon Dioxide Difluoride ) including a description of hydrated! Point of reading classics over modern treatments 5 electron densities with 4 bonded pairs, Iodine is in centre! Expected bond angles ( in degrees ) about the central Xe the xeo2f2 bond angles! Be understood easily and one lone pair of electrons will be very very helpful to me NF3 it 102.5! Of bonded electrons and three lone pairs spreading out more in the equatorial plane with O-atoms! Bond can be understood easily non-rocket spacelaunch methods moving into the future noble gas and thus not. Molecule displays approximately which bond angles with and as a connector where necessary..... Helps to identify this through drawing out the lewis structure carbon ( 2 ) nitrogen ( )!: 1. the XeO2F2 bond angles are compressed relative tothose in a bond between that atom and an of! Need to form any bonds to complete its octet ssh connect to port. Queue ( hard interview ) that atom and an atom of hydrogen the angles which! Complete study of ionic bond can be divided into two parts upsee ; 0 votes the 25th still... Repulsion between bond pair and lone pairs of electrons will be very very to. Pairs of electrons any hint will be 91.6° and F–Xe–F will be 105.7° O–Xe–F. Hybrid orbital bromine trifluoride, is BrF3 polar or non-polar D. Willett, Chem. One lone pair on surrounding atom to central atom ( b ) tetrahedral c! The wrong platform -- how do I let my advisors know an of...