Question

Complete the following table.

Hint: Drawing the Lewis structures for these molecules after

obtaining the total valence electrons will help you to complete the table)

FIND:

Molecule Total Valence Electrons in Molecule

Total Electron Domains around Central Atom

Electron-Domain

Shape (Geometry)

No. of Bonding Domains around Central Atom

Number of Nonbonding Domains around Central Atom

VSEPR Class

Molecular Shape (Geometry)

Polar? Y/N

WITH THESE MOLECULES:

HCN

BH3

SnCl2

NH4+

H3

O+

NO2

SbF5

SeF4

BrF3

XeF2

SeF6

IF5

XeF4

2. Draw a possible Lewis structure for the IF 7molecule. List a possible name for the shape of this

molecule (Hint: Consider what this molecule would look like in three-dimensions. As you have

seen in this lab, consider how the three-dimensional appearance of the molecule is related to

its shape name.

Answer 1

1. HEN, in it ce 11 MCN, In HCN molecule the Central atom is C 'c's valame 25 2p electrons Dexcited state D FIT 'Y'electrons doncked by Substitucerols Nand H! AeN molecule 1x molecule o xlix hxt In HCN, the Centroal n Carbon atomis Sp' 'c'in It NiN hybridised. . Geometry around central atom C is linear and den to the abrence of any lone pain the shape of the molecule is also linear H-CEN: • The molecule is polaru. 2. BHz herce the Central atom is'B'. 28 2p B's valance 25 4 2p a P excited in hit Starle election Bin 7x7 x 20 BH2 molecule it HH an BH₂, the central B Ksp atom is sphybridised with a vacent present paropendicular to the mokcular plane. prombital · Gyecmetry anound B’atom 9s trigonal planer due to the absence of any lone pairs its shape is also trigonal planac. · H ---BCH .. BHz is nonpdare molecule. His ?H H's are electronegative coith respect to B.

3. Snely as In Invalance 14 hlin election In Snely, the central adom. In is sph In Snd "Sulins in Inch 14 Fx hybridised due to the prresence of molecule ² F oot Hence geometry around . ksp Sn is trigonal planarbut the presence of one lone pain of electrons in one of the sites hence it is V-shaped bent molecule. f 'Snel, will be less cé a to polar ono non polar a in nature because a t the besultant dipole moment of two Su-ci bond is some extend nullified by the oppositedinected Cone periro moment, 4, Night 1 2p 25 2p N'valance at 114 1117 fleetroon. N'in NH Ã ALL 1x1x1x lon. an Niation the i Oro TH H H Hi Centoral atom No K Sp3 is sp3 hybridised A Hence around N is tetrahedral (5) geometry

shape of the MHgt im is also detrahednal. All are bonding electrons here, mi nolone pair o'nonbonding NO ! elections are there. H- H . Nilaion is now polar. IRI 5. Hz of an Hgotion the H Central atomis oxygend, o'ralance 2s 2p electron kl 1171 In Haotion the central 'o' in Heat 17 (22Fox|] O'rtom is Sp3 hepbridised lars H H H with 3 bond pain's and k sp3y one lone pain. 'The geometry around oxygen is tetrahedroal but the shape of the molecule due to the for the presence of One lone pair in efore of the sites, is triangular pyramidal.' Hoot is polare in natevce.

6. NO2 N'valance THT 2s 2p electron Nin No, Fixtuxt I ok 1] [- In NO2, the N is s/ hybridised and it is a nadical. Geometry anound N is triangular pat planar but due to the prossence of one free radical hence its shape is bent i Wix less polar por non tolar O Bologna nadeece, t. Sbtn Sb'valonce 5S 12 5p 5d. ] ITU electron Sb' in Shfs 7x [7x | 1x|1x] [7x|| Sp3d = (5 bond parro, Renolone In Sbtag the Central Sbatom is spat hukbroidised Pain System) Hence geometry around So trigonal bip promical

Shap is also trigonal bispanidal (TBP) FEES T A ť It is rion polar molecule! Asbaf f lt . 8. Sefa 45 44 ... 45 4p. Se Valanec electrons 2 111 1 moleculen T limfax FM FIKTIO 4d 1 1 Sein Sefa * Spåd Geometry. Arround control A bond pain Alone pair System atom se is trigonal bipuramidal Tante but due to the presence of one love parin in the plane it looks See-Saw sheipedi ose: F It is also non-polaro. 7

9. Bra fiz d Bré' valance 48 4p 4d 71 7147 electron H En'in Bofy flad TXIM IT v r2 lone paint k spid 3 bond parts Geometry around Broitin angulare System. Shape of the molecule bipyramidal ! y T-Shaped st-souch fa Bronts 8. Brotz is 5d. 10.. Xefgar 55 SP non-polare molecule. xe valene glocnu | Tinh | 11 Xéin Xef 114 12h41x Ext : Spids Te in Xefnis Späd hybridised with and 2 bond pains in 3 lone paro Geometray around xe Shape lineare trigonal bippamidal

Non-polar molecule. マーメー 11. Seff Se' valance 45 4P chi 4d 1 1 1] electron ГГГГГ Sein Sefe de muerte firx]/7xI D Ffff rel k spadt In Sefs, the central se atom is Sp3d . hybridised having 6 bond pains. Geometry and the Shape of the molecule is octahedsal. fin-1 F It is non-polar Tici molecule. 12. IF 55 5p . Sd I'valancslestron z para LITT De in Ifis L Lexfan. ML D TOTT F FF FF. -Spade

In Ifa molecule the Central I' is Sp34 hybralized with a band pains, and one lone paniro. Geometry around I' ~ Octahedral Shape → square pyramidal. THE Non-polare molecule. o. Xefa as se | X® sa 1 thun III " O Te in ll (11|p1 xl 7xHxD Xefa k spad The Corrforal Xelatom is Spad hybridised with 4 bond pains and two lone paines. Geometory octahedaal Shape y square planar as two lone pains takes frons-position in octahedral geometry Xe A Xefe is also now polac i t molecule.

G 55 5p. 50 II LI TIN 17! Tx/tx{1x] [7x17x |1x1 719 K spad? an It, molecule the centro de Pentom is sp33 heybridised with seven bond painos, Geometry amound D' is pentagonal bipynomsbel Shape of Ify is also pentagonal bipyramidal. 'f fuit f. It is a polar molecule as the bond homarof of fifth I-f bond in the plane is not nullified.