Question

Give the number of total electron groups, the number of bonding groups, and the number of lone pairs for (a) geometry.

Express your answers as an integer. Enter your answers in ascending order separated by commas.

 

 

Give the number of total electron groups, the number of bonding groups, and the number of lone pairs for (b) geometry.

Express your answers as an integer. Enter your answers in ascending order separated by commas.

 

 

Give the number of total electron groups, the number of bonding groups, and the number of lone pairs for (c) geometry.

Express your answers as an integer. Enter your answers in ascending order separated by commas.

Answer 1

Concepts and reason

The shapes of molecules or ions can be explained based on valence shell electron pair repulsion (VSEPR) model. This model is mainly applicable to p-block elements.

Fundamentals

The main postulates of VSEPR model is as follows:

(i) The shape of molecule depends on the electron-electron repulsions present in the valence shell of the central atom.

(ii) The repulsive interactions between the electron pairs are in the following order:

${\rm{lone pair - lone pair}} > {\rm{lone pair - bonding pair}} > {\rm{bonding pair - bonding pair}}$

(iii) If the central atom forms multiple bonds, then the order of electron–electron repulsions between them is as follows:

${\rm{triple bond - single bond}} > {\rm{double bond - single bond}} > {\rm{single bond - single bond}}$

(a)

The given model is as follows:

The shape of the model is octahedral.

For this shape, the total number of electron groups is 6. The numbering bonding groups is 6 and the number of lone pairs is 0.

Therefore, the answer for (a) is 6,6,0.

(b)

The given model is as follows:

The shape of the model is square planar.

For this shape, the total number of electron groups is 6. The numbering bonding groups is 4 and the number of lone pairs is 2.

Therefore, the answer for (b) is 6,4,2.

(c)

The given model is as follows:

The shape of the model is seesaw.

For this shape, the total number of electron groups is 5. The numbering bonding groups is 4 and the number of lone pairs is 1.

Therefore, the answer for (c) is 5,4,1.

Ans: Part a

The answer for (a) is 6,6,0.

Part b

The answer for (b) is 6,4,2.

Part c

The answer for (c) is 5,4,1.