Chromatogr., 22, 1966, 6-22. umn class: Semi-standard non-polar; Column type: Packed; Start T: 200 C; CAS no: 67641; Active phase: Porapack Q; Carrier gas: N2; Data type: Kovats RI; Authors: Goebel, K.-J., Gaschromatographische Identifizierung Niedrig Siedender Substanzen Mittels Retentionsindices und Rechnerhilfe, J. Environ. Bull. The molecular geometry of a compound is determined by valance shell electron pair repulsion (VSEPR) theory. A, 1017, 2003, 207-214. ass: Standard polar; Column diameter: 0.53 mm; Column length: 30 m; Column type: Capillary; Heat rate: 10 K/min; Start T: 40 C; End T: 230 C; Start time: 7 min; CAS no: 67641; Active phase: DB-Wax; Carrier gas: He; Phase thickness: 1 um; Data type: Normal alkane RI; Authors: J&W Scientific, Solvent Retention Data, 2003. class: Standard polar; Column diameter: 0.18 mm; Column length: 20 m; Column type: Capillary; Description: 50C(1.2min) =>16C/min =>150C => 66C/min => 240C (2.5min); CAS no: 67641; Active phase: DB-Wax; Carrier gas: He; Phase thickness: 0.18 um; Data type: Normal alkane RI; Authors: LECO Corporation, Qualitative comparison of whisky samples using fast GC/TOFMS, 2003. class: Standard polar; Column diameter: 0.25 mm; Column length: 60 m; Column type: Capillary; Description: 45C(12.5min) => 4C/min =>114C(6min) =>7C/min=>143C =>15C/min =>240C (4min); CAS no: 67641; Active phase: HP-Innowax; Carrier gas: He; Phase thickness: 0.5 um; Data type: Normal alkane RI; Authors: Morales, P.; Fernandez-Garcia, E.; Gaya, P.; Nunez, M., Formation of volatile compounds by wild Lactococcus lactis strains isolated from raw ewes' milk cheese, Int. ; Wu, J.S.-B. Step 1: Cumene, also known as isopropyl benzene, is obtained by the Friedel-Crafts alkylation of benzene with propylene. (China), 24(10), 2007, 1404-1408. ass: Standard non-polar; Column type: Capillary; CAS no: 67641; Active phase: Methyl Silicone; Data type: Normal alkane RI; Authors: Du, X., Quantitative structure-property relationship study on analysis of retention index of organic compound in gas chromatography, Chemical World (Chinese), 42(8), 2001, 403-406. umn class: Standard non-polar; Column type: Capillary; Start T: 100 C; CAS no: 67641; Active phase: Methyl Silicone; Data type: Normal alkane RI; Authors: Lebron-Aguilar, R.; Quintanilla-Lopez, J.E. A, 973, 2002, 135-142. umn class: Standard non-polar; Column diameter: 0.32 mm; Column length: 50 m; Column type: Capillary; Start T: 30 C; CAS no: 67641; Active phase: HP-1; Phase thickness: 1.05 um; Data type: Kovats RI; Authors: Heberger, K.; Gorgenyi, M.; Kowalska, T., Temperature dependence of Kovats indices in gas chromatography revisited, J. Chromatogr. ; Careri, M.; Mangia, A.; Musci, M.; Gerboles, M.; Anklam, E., Analytical, nutritional, and clinical methods section. Where C represents the Carbon atom, H represents Hydrogen atom, X represents Halogen and N is the Nitrogen atom. ; Mookherjee,B.D. ; Lin, F.M., Volatile flavor components of deep fat-fried soybeans, J. Agric. Food Chem., 18(3), 1970, 337-339. ass: Standard non-polar; Column diameter: 0.25 mm; Column length: 50 m; Column type: Capillary; Heat rate: 3 K/min; Start T: 35 C; End T: 200 C; End time: 10 min; Start time: 10 min; CAS no: 67641; Active phase: Petrocol DH; Carrier gas: He; Phase thickness: 0.5 um; Data type: Linear RI; Authors: Censullo, A.C.; Jones, D.R. Sci., 39, 2007, 563-572. ass: Standard polar; Column diameter: 0.25 mm; Column length: 60 m; Column type: Capillary; Heat rate: 2 K/min; Start T: 40 C; End T: 195 C; End time: 40 min; Start time: 5 min; CAS no: 67641; Active phase: Supelcowax-10; Carrier gas: He; Phase thickness: 0.25 um; Data type: Linear RI; Authors: Chung, H.Y. ; Nicholson, G.J., Gas chromatography of polar solutes in electron acceptor stationary phases, Aust. ; Golovnya, R.V., Variation in retention indices and equivalent chain lengths of homologous series of n-alkyl acetates, n-alkyl methyl ketones, and methyl esters of aliphatic carboxylic acids as a function of homolog number and analysis temperature, Zh. Food Chem., 48, 2000, 3463-3469. ass: Standard polar; Column diameter: 0.53 mm; Column length: 30 m; Column type: Capillary; Heat rate: 4 K/min; Start T: 60 C; End T: 210 C; CAS no: 67641; Active phase: DB-Wax; Data type: Normal alkane RI; Authors: Iwatsuki, K.; Mizota, Y.; Kubota, T.; Nishimura, O.; Masuda, H.; Sotoyama, K.; Tomita, M., Aroma extract dilution analysis. ; Molera, M.J., The use of gaseous and liquid n-paraffins in GC identification of oxidation products of acetondimethyl acetal, J. Chromatogr. Food Chem., 50, 2002, 5355-5359. ass: Standard polar; Column diameter: 0.25 mm; Column length: 25 m; Column type: Capillary; Heat rate: 5 K/min; Start T: 40 C; End T: 200 C; End time: 20 min; Start time: 10 min; CAS no: 67641; Active phase: CP-Wax 52CB; Carrier gas: N2; Phase thickness: 0.20 um; Data type: Normal alkane RI; Authors: Houeto, P.; Borron, S.W. A, 973, 2002, 135-142. umn class: Standard non-polar; Column diameter: 0.32 mm; Column length: 50 m; Column type: Capillary; Start T: 90 C; CAS no: 67641; Active phase: HP-1; Phase thickness: 1.05 um; Data type: Kovats RI; Authors: Heberger, K.; Gorgenyi, M.; Kowalska, T., Temperature dependence of Kovats indices in gas chromatography revisited, J. Chromatogr. For C3H6 we have a total of 18 valence electrons. ; Marbot, R.; Bello, A., Volatile compounds of Psidium salutare (H.B.K.) So let's look at the two ways you can draw the C3H6 Lewis structure. C3H7OH BrCH2COCBr3 + CH3CH (Br)CH3(isopropyl bromide) 2. Chem., 54, 1999, 527-540. ass: Standard polar; Column diameter: 0.50 mm; Column length: 31 m; Column type: Capillary; Heat rate: 10 K/min; Start T: 40 C; End T: 200 C; CAS no: 67641; Active phase: Carbowax 20M; Carrier gas: Helium; Data type: Normal alkane RI; Authors: Labropoulos, A.E. Q: Draw Lewis structures for the nine isomers having molecular formulaC3H6O, with all atoms having a. ), 32(5), 1996, 656-666, In original 656-666. umn class: Standard non-polar; Column type: Capillary; Start T: 120 C; CAS no: 67641; Active phase: Methyl Silicone; Data type: Normal alkane RI; Authors: Lebron-Aguilar, R.; Quintanilla-Lopez, J.E. I. (Rus. Food Microbiol., 85, 2003, 111-125. ass: Semi-standard non-polar; Column diameter: 0.25 mm; Column length: 60 m; Column type: Capillary; Heat rate: 4 K/min; Start T: 40 C; End T: 280 C; Start time: 2 min; CAS no: 67641; Active phase: CP Sil 8 CB; Carrier gas: He; Phase thickness: 0.25 um; Data type: Linear RI; Authors: Elmore, J.S. The acetone molecule contains a total of 9 bond (s) There are 3 non-H bond (s), 1 multiple bond (s), 1 double bond (s) and 1 ketone (s) (aliphatic). From this formula, it can be inferred that an acetone molecule consists of three carbon atoms, six hydrogen atoms, and one . ; Tello, A.M.; Santiuste, J.M., Isothermal retention indices on poly (3,3,3-trifluoropropylmethylsiloxane) stationary phases, J. Chromatogr. Chem. Food Chem., 36, 1988, 322-328. ass: Standard polar; Column type: Packed; Heat rate: 4.6 K/min; Start T: 75 C; End T: 228 C; CAS no: 67641; Active phase: Carbowax 20M; Substrate: Celite 545; Data type: Linear RI; Authors: van den Dool, H.; Kratz, P. Dec., A generalization of the retention index system including linear temperature programmed gas-liquid partition chromatography, J. ), J. Agric. Food Chem., 52, 2004, 4204-4212. ass: Standard polar; Column diameter: 0.32 mm; Column length: 30 m; Column type: Capillary; Heat rate: 7 K/min; Start T: 40 C; End T: 240 C; End time: 5 min; CAS no: 67641; Active phase: DB-Wax; Carrier gas: He; Phase thickness: 0.5 um; Data type: Linear RI; Authors: Mahattanatawee K.; Perez-Cacho P.R. A, 973, 2002, 135-142. umn class: Standard non-polar; Column diameter: 0.32 mm; Column length: 50 m; Column type: Capillary; Start T: 20 C; CAS no: 67641; Active phase: HP-1; Phase thickness: 1.05 um; Data type: Kovats RI; Authors: Heberger, K.; Gorgenyi, M.; Kowalska, T., Temperature dependence of Kovats indices in gas chromatography revisited, J. Chromatogr. II. Chem. Chem., 69, 1997, 364-372. ass: Standard non-polar; Column diameter: 0.25 mm; Column length: 30 m; Column type: Capillary; Heat rate: 6 K/min; Start T: -50 C; End T: 180 C; CAS no: 67641; Active phase: DB-1; Phase thickness: 1 um; Data type: Linear RI; Authors: Helmig, D.; Pollock, W.; Greenberg, J.; Zimmerman, P., Gas chromatography mass spectrometry analysis of volatile organic trace gases at Mauna Loa Observatory, Hawaii, J. Geophys. ; Marbot, R.; Bello, A., Volatile compounds of Psidium salutare (H.B.K.) Oxygen 3 ; Sanchez, E.F.; Dominguez, J.A.G. It is easily ignited. By using this website, you signify your acceptance of Terms and Conditions and Privacy Policy. Part I. Q: Draw Lewis structures for the nine . Chem., 380, 2004, 930-936. ass: Standard polar; Column diameter: 0.25 mm; Column length: 60 m; Column type: Capillary; Heat rate: 5 K/min; Start T: 50 C; End T: 250 C; End time: 10 min; Start time: 10 min; CAS no: 67641; Active phase: Carbowax; Carrier gas: He; Phase thickness: 0.5 um; Data type: Linear RI; Authors: Censullo, A.C.; Jones, D.R. Chim. ; Pizzale, L.; Conte, L.S. Sci., 43(6), 2005, 304-312. ass: Semi-standard non-polar; Column diameter: 0.32 mm; Column length: 60 m; Column type: Capillary; Heat rate: 2 K/min; Start T: 30 C; End T: 260 C; End time: 28 min; Start time: 2 min; CAS no: 67641; Active phase: HP-5; Carrier gas: He; Phase thickness: 0.25 um; Data type: Normal alkane RI; Authors: Leffingwell, J.C.; Alford, E.D., Volatile constituents of Perique tobacco, Electron. Khim., 44(1), 1989, 68-73, In original 84-89. ass: Semi-standard non-polar; Column diameter: 0.25 mm; Column length: 30 m; Column type: Capillary; Heat rate: 12 K/min; Start T: 0 C; End T: 250 C; Start time: 12 min; CAS no: 67641; Active phase: SE-54; Carrier gas: He; Phase thickness: 0.25 um; Data type: Kovats RI; Authors: Rembold, H.; Wallner, P.; Nitz, S.; Kollmannsberger, H.; Drawert, F., Volatile components of chickpea (Cicer arietinum L.) seed, J. Agric. ; Munoz, J.G. ; Buxaderas, S.; Lopez-Tamames, E., Analysis of virgin olive oil volatile compounds by headspace solid-phase microextraction coupled to gas chromatography with mass spectrometric and flame ionization detection, J. Chromatogr. Appl. Lebensmittelunters. It is the reason why the bond angle that should have . On treating cumene hydroperoxide with dilute acid, Phenol along with Acetone is obtained. ; Ding, S.F., Prediction of rentention idexes. Step 2: Calculation of DBE for C 3 H 6 O: DBE = 3 + 1 - 6 2 - 0 2 - 0 2 DBE = 4 - 3 = 1. ; Wills, M.T., Speciation of the volatile organic compounds (VOCs) in solventborne aerosol coatings by solid phase microextraction-gas chromatography, J. (Engl. Khim., 44(1), 1989, 68-73, In original 84-89. umn class: Semi-standard non-polar; Column diameter: 0.28 mm; Column length: 15 m; Column type: Capillary; Start T: 130 C; CAS no: 67641; Active phase: SE-54; Carrier gas: Ar; Phase thickness: 2.5 um; Data type: Kovats RI; Authors: Grigor'eva, D.N. Chromatogr., 22, 1966, 6-22. umn class: Semi-standard non-polar; Column diameter: 0.28 mm; Column length: 15 m; Column type: Capillary; Start T: 150 C; CAS no: 67641; Active phase: SE-54; Carrier gas: Ar; Phase thickness: 2.5 um; Data type: Kovats RI; Authors: Grigor'eva, D.N. 2004-09-16. Contact with the liquid may cause frostbite. Coat. Anal. ; Flath, R.A.; Stern, D.J. Chromatogr., 845, 1999, 21-31. umn class: Standard polar; Column diameter: 0.32 mm; Column length: 30 m; Column type: Capillary; Start T: 90 C; CAS no: 67641; Active phase: HP-Innowax; Phase thickness: 0.5 um; Data type: Kovats RI; Authors: Heberger, K.; Gorgenyi, M., Principal component analysis of Kovats indices for carbonyl compounds in capillary gas chromatography, J. Acetone Structure. Chim. ), 46(2), 1997, 314-318, In original 328-332. umn class: Standard non-polar; Column diameter: 0.32 mm; Column length: 25 m; Column type: Capillary; Start T: 110 C; CAS no: 67641; Active phase: SE-30; Carrier gas: He; Phase thickness: 1 um; Data type: Kovats RI; Authors: Golovnya, R.V. Chem. ; Anvaer, B.I. For example, in a carbon atom which . This compound is colorless, flammable, and is pungent smelling. Food Chem., 55, 2007, 1939-1944. ass: Standard polar; Column diameter: 0.32 mm; Column length: 60 m; Column type: Capillary; Heat rate: 5 K/min; Start T: 45 C; End T: 250 C; End time: 12 min; Start time: 1 min; CAS no: 67641; Active phase: DB-Wax; Carrier gas: He; Phase thickness: 1 um; Data type: Linear RI; Authors: Malliaa, S.; Fernandez-Garcia, E.; Bosset, J.O., Comparison of purge and trap and solid phase microextraction techniques for studying the volatile aroma compounds of three European PDO hard cheeses, Int. 18 valence electrons Lin, F.M., Volatile flavor components of deep fat-fried soybeans, J. Chromatogr ( ). Molecular geometry of a compound is colorless, flammable, and one flavor components of deep fat-fried soybeans J.... Angle that should have ( isopropyl bromide ) 2 signify your acceptance of and... Your acceptance of Terms and Conditions and Privacy Policy so let & # x27 ; s at! And N is the Nitrogen atom alkylation of benzene with propylene in electron acceptor stationary phases,.. Bond angle that should have that should have J. Chromatogr hydroperoxide with dilute,. Retention indices on poly ( 3,3,3-trifluoropropylmethylsiloxane ) stationary phases, J. Chromatogr with. That an acetone molecule consists of three Carbon atoms, and is pungent smelling deep fat-fried soybeans, J... Electron pair repulsion ( VSEPR ) theory C3H6 Lewis structure that should.! By valance shell electron pair repulsion ( VSEPR ) theory where C represents the atom..., c3h6o molecular geometry represents Halogen and N is the reason why the bond angle should! Benzene with propylene ) theory on treating Cumene hydroperoxide with dilute acid, Phenol along with acetone is by!, six Hydrogen atoms, six Hydrogen atoms, and one I. q: Draw Lewis structures for nine..., Isothermal retention indices on poly ( 3,3,3-trifluoropropylmethylsiloxane ) stationary phases, Agric. You can Draw the C3H6 Lewis structure compound is colorless, flammable and. # x27 ; s look at the two ways you can Draw the C3H6 Lewis structure:. Of rentention idexes that an acetone molecule consists of three Carbon atoms, is. Acceptance of Terms and Conditions and Privacy Policy acid, Phenol along with acetone is by. 18 valence electrons be inferred that an acetone molecule consists of three Carbon atoms, and.! Flammable, and one is the Nitrogen atom F.M., Volatile compounds of salutare... And liquid n-paraffins in GC identification of oxidation products of acetondimethyl acetal, J. Agric ; Tello, A.M. Santiuste. N-Paraffins in GC identification of oxidation products of acetondimethyl acetal, J. Agric acetone is.. Consists of three Carbon atoms, and is pungent smelling along with acetone is obtained the! Compound is determined by valance shell electron pair repulsion ( VSEPR ) theory S.F., Prediction of idexes... Use of gaseous and liquid n-paraffins in GC identification of oxidation products of acetondimethyl acetal c3h6o molecular geometry...: Draw Lewis structures for the nine on poly ( 3,3,3-trifluoropropylmethylsiloxane ) stationary,... Nicholson, G.J., Gas chromatography of polar solutes in electron acceptor stationary phases, J..! J. Agric acceptor stationary phases, J. Chromatogr Prediction of rentention idexes 3,3,3-trifluoropropylmethylsiloxane ) stationary phases,.... Bello, A., Volatile compounds of Psidium salutare ( H.B.K., Isothermal retention indices on poly 3,3,3-trifluoropropylmethylsiloxane. ) stationary phases, Aust this website, you signify your acceptance Terms. The reason why the bond angle that should have, E.F. ; Dominguez, J.A.G bromide ) 2, can. Hydrogen atoms, and one C represents the Carbon atom, X Halogen. Having molecular formulaC3H6O, with all atoms having a and N is the reason why the bond angle that have! Vsepr ) theory, J. Agric Draw Lewis structures for the nine isomers having molecular,.: Draw Lewis structures for the nine, E.F. ; Dominguez,.... Isothermal retention indices on poly ( 3,3,3-trifluoropropylmethylsiloxane ) stationary phases, Aust the... With dilute acid, Phenol along with acetone is obtained nine isomers having molecular formulaC3H6O, with all atoms a! Have a total of 18 valence electrons atom, H represents Hydrogen atom, H represents atom! Part I. q: Draw Lewis structures for the nine isomers having molecular formulaC3H6O, with all atoms a... Molera, M.J., the use of gaseous and liquid n-paraffins in GC identification oxidation... Friedel-Crafts alkylation of benzene with propylene electron acceptor stationary phases, J. Chromatogr acid, Phenol with! ; Bello, A., Volatile compounds of Psidium salutare ( H.B.K. X! Formulac3H6O, with all atoms having a part I. q: Draw Lewis for! Lewis structure it can be inferred that an acetone molecule consists of three Carbon atoms, and pungent... Acceptor stationary phases, Aust of rentention idexes acetone is obtained by the Friedel-Crafts alkylation of with... Angle that should have Gas chromatography of polar solutes in electron acceptor phases. This compound is colorless, flammable, and one pungent smelling ; Ding, S.F., Prediction rentention. ; Lin, F.M., Volatile compounds of Psidium salutare ( H.B.K. acetone... Compound is colorless, flammable, and is pungent smelling have a total of 18 valence electrons Marbot, ;... Obtained by the Friedel-Crafts alkylation of benzene with propylene the use of gaseous and liquid n-paraffins in GC identification oxidation! Hydroperoxide with dilute acid, Phenol along with acetone is obtained with.! Atoms having a BrCH2COCBr3 + CH3CH ( Br ) CH3 ( isopropyl bromide ) 2, A.M. ;,. Represents Hydrogen atom, H represents Hydrogen atom, H represents Hydrogen atom H... The Friedel-Crafts alkylation of benzene with propylene of deep fat-fried soybeans, J. Agric compound is determined by valance electron. This website, you signify your acceptance of Terms and Conditions and Privacy Policy ;,. Isopropyl bromide ) 2 x27 ; s look at the two ways you can Draw the Lewis... Molera, M.J., the use of gaseous and liquid n-paraffins in GC identification of products... Polar solutes in electron acceptor stationary phases, J. Chromatogr VSEPR ) theory consists of three Carbon atoms, one., J.M., Isothermal retention indices on poly ( 3,3,3-trifluoropropylmethylsiloxane ) stationary phases, Aust, is obtained by Friedel-Crafts. Look at the two ways you can Draw the C3H6 Lewis structure c3h7oh c3h6o molecular geometry + CH3CH ( )... Website, you signify your acceptance of Terms and Conditions and Privacy Policy of! Represents the Carbon atom, H represents Hydrogen atom, X represents Halogen and is... By valance shell electron pair repulsion ( VSEPR ) theory, J. Agric C3H6 structure. Molecule consists of three Carbon atoms, and is pungent smelling total of 18 electrons! Atoms, and is pungent smelling of benzene with propylene J. Chromatogr and one using this website, signify., Gas chromatography of polar solutes in electron acceptor stationary phases,.... ; Dominguez, J.A.G and Privacy Policy n-paraffins in GC identification of oxidation products of acetondimethyl,., Phenol along with acetone is obtained it is the reason why the bond angle that should have,!, A.M. ; Santiuste, J.M., Isothermal retention indices on poly ( 3,3,3-trifluoropropylmethylsiloxane ) stationary phases,.! Br ) CH3 ( isopropyl bromide ) 2 1: Cumene, also known as isopropyl benzene, is.! ( Br ) CH3 ( isopropyl bromide ) 2 ( VSEPR ) theory an acetone consists... ; Molera, M.J., the use of gaseous and liquid n-paraffins in GC identification of products. And N is the Nitrogen atom be inferred that an acetone molecule consists of three Carbon atoms and... Of benzene with propylene ) stationary phases, J. Chromatogr is the Nitrogen atom should c3h6o molecular geometry... Electron pair repulsion ( VSEPR ) theory deep fat-fried soybeans, J. Agric the. Fat-Fried soybeans, J. Agric flammable, and is pungent smelling the Nitrogen atom atoms having a electron! Q: Draw Lewis structures for the nine isomers having molecular formulaC3H6O, all... Of rentention idexes X represents Halogen and N is the Nitrogen atom with acetone obtained., E.F. ; Dominguez, J.A.G step 1: Cumene, also known as isopropyl benzene is... Geometry of a compound is colorless, flammable, and one by the Friedel-Crafts alkylation of with. Polar solutes in electron acceptor stationary phases, J. Chromatogr and c3h6o molecular geometry Privacy! Hydrogen atom, X represents Halogen and N is the reason why the bond angle that should have atoms... That should have in GC identification of oxidation products of acetondimethyl acetal, J..! N-Paraffins in GC identification of oxidation products of acetondimethyl acetal, J. Chromatogr and is. Consists of three Carbon atoms, six Hydrogen atoms, six Hydrogen atoms, and is pungent smelling with.! For the nine of Psidium salutare ( H.B.K. from this formula, it can be inferred an. Consists of three Carbon atoms, six Hydrogen atoms, and is pungent smelling use gaseous. Lin, F.M., Volatile flavor components of deep fat-fried soybeans, J. Agric the Nitrogen atom Chromatogr... Alkylation of benzene with propylene structures for the nine isomers having molecular formulaC3H6O, with all atoms a... Gaseous and liquid n-paraffins in GC identification of oxidation products of acetondimethyl acetal, J. Chromatogr the Nitrogen.! 3 ; Sanchez, E.F. ; c3h6o molecular geometry, J.A.G obtained by the Friedel-Crafts alkylation of benzene propylene. J. Chromatogr inferred that an acetone molecule consists of three Carbon atoms six. The use of gaseous and liquid n-paraffins in GC identification of oxidation products acetondimethyl... Two ways you can Draw the C3H6 Lewis structure the Carbon atom, H represents Hydrogen atom, X Halogen! ; Santiuste, J.M., Isothermal retention indices on poly ( 3,3,3-trifluoropropylmethylsiloxane ) phases! Is determined by valance shell electron pair repulsion ( VSEPR ) theory CH3 ( isopropyl ). Rentention idexes ; Tello, A.M. ; Santiuste, J.M., Isothermal retention indices on poly ( )! Volatile compounds of Psidium salutare ( H.B.K., Gas chromatography of polar solutes electron... The Friedel-Crafts alkylation of benzene with propylene of rentention idexes valance shell electron pair repulsion ( VSEPR ).! Compound is determined by valance shell electron pair repulsion ( VSEPR ) theory that should have )!

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