Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following?

Question

Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following
a) H3O+
electron-group arrangement:?
molecular shape:?
ideal bond angle:?
(b) SiCl4
electron-group arrangement:?
molecular shape:?
ideal bond angle:?
c) NF3
electron-group arrangement:?
molecular shape:?
ideal bond angle:?

Answer 1

In all cases the arragngement is tetrahedral and thus the ideal bond angle would be 109.5 degrees. In detail:

a) O has 2 unpaired e and 2 lone pairs. In H3O+, the 2 e participate in two single bonds with H and one lone pair participates in a dative bond with H+. Thus you have 3 single bonds + 1 lone pair so the arrangement is tetrahedral. lone pair-bond electron repulsion is stronger than bond electron-bond electron and thus the actual bond angles will be smaller.
The shape of the molecule will be trigonal pyramid (It is actually tetrahedral with O in the center and on one corner you have the lone pair but the lone pair is not "visible" in the molecular level)

b) Si belongs to the same group as C. It forms 4 identical single bonds in SiCl4 and has no lone pairs. Thus both the molecular shape and the electron arrangement are normal tetrahedral with bond angles 109.5

c)N has 3 unpaired e and one lone pair. In NF3 it forms 3 single bonds through the unpaired e and so it has 3 bonds + 1 lone pair. Thus it is similar to H3O+ (tetrahedral electron arrangement, ideal bond angle 109.5, true bond angle smaller, molecular shape trigonal pyramid)

Answer 2

Electron Group Arrangement

Answer 3

(a) There are 3 covalent bonds and one lone pair of electrons. It is planar, with the angles between covalently bonded F larger than 120 degrees, and the angle between the lone pair a bit smaller, because of the greater repulsion by the 2 bond-pair nuclei. The normal for the bond angle between the 2 H's is 104.5 degrees But the positively hydrogen will force that angle to be smaller. Also a planar molecule. ClO2- is linear at 180 degrees as the 2 oxygens are exactly opposite each other with one coordinatecovalent bond and the other covalent bond across from it.

Answer 4

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RE:
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following?
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following
a) H3O+
electron-group arrangement:?
molecular shape:?
ideal bond angle:?
(b) SiCl4
electron-group arrangement:?
molecular shape:?
ideal bond angle:?
c) NF3
electron-group...

Answer 5

trigonal planer
tigonal planer
120