Question

2. Consider the following molecules or ions: NO F, IF3, AsFs, and IO2. Answer the following questions based on the Lewis structures and VSEPR theory prediction of their molecular shapes. (a) Which one has only bond angles of 109.5°? (b) Which one has only bond angles of 120°? (c) Which one has bond angles of 90 and 180°? (d) Which one has bond angles of 90, 120, and 180°?

Answer 1

According to valence Shell Electron pair Repulsion theory, the Geometry and shapes are determined from . Starie number (S.N) ... SiN is calculated by using the formula V + N - PUN s n= 2 V= ct Number of valence electroms N = Number of monovalent atoms. P = total.net positive charge on the molecule. . N = net tove charge. ..(a) Io- has only bond angle 109:50 VCI)=7 ; N=0; P=0, N=-1. 7 +0+0+1 = 24 sin = 4 = tetrahedral " 1110.9.50 . Because. Sin = 2 (b) NO₂F has only bond angle of 20 NCT) = Nitrogen has s valence electrons. Scanned with CamScanner .. Vas

23. N= 1 . due to one F atom c. Sine 5+10+ 0 = . S.N=3 trigonal planer 20 . has 1209. 90' and 180° © Ifs has bond angle 0 +0 7 +3 -5= 5 SIN 2 AS - S.N=5= ③. trigonal bipyramidal Seometry.. CT B.P) 217*®T- Shape o 180° @ Asfs has bond angle 90, 120° and 1800 Sin = 575,- 070-5--> T. Bip 2 VEquitorial AS OF Focate. Fibond angle 02120 1800 Voxid F - Equitorial I 180 e Fraxial has bond angle ® and axial i Scanned with CamScanner has 180°