Q 6.74 - An Introduction to General, Organic, and Biological Chemistry

Question

Complete each of the following statements for a molecule of ${\mathrm{H}}_2\mathrm{S}$ :
a. There are          electron groups around the central $\mathrm{S}$ atom.
b. The electron-group geometry is          .
c. The number of atoms attached to the central $\mathrm{S}$ atom is         

d. The shape of the molecule is          .

Step-by-Step Solution

Answer

Filling the blanks we get:

a. There are $\underline{ 4 }$ electron groups around the central $\mathrm{S}$ atom.
b. The electron-group geometry is     tetrahedral     .
c. The number of atoms attached to the central $\mathrm{S}$ atom is    two     

d. The shape of the molecule is     bent     .

Part(a) Step 1: Given Information

We are given a molecule ${\mathrm{H}}_2\mathrm{S}$ for that we need to fill in the blank: There are          electron groups around the central $\mathrm{S}$ atom. 

Part (a) Step 2: Explanation

Above is structure of ${\mathrm{H}}_2\mathrm{S}$.

Central atom $\mathrm{S}$ has four electron groups around it $\Rightarrow$ two single bonds between $\mathrm{S}$ and $\mathrm{H}$ atom and two lone pairs on it.

Hence, There are $\underline{ 4 }$ electron groups around the central $\mathrm{S}$ atom.

Part(b) Step 1: Given Information

We are given a molecule ${\mathrm{H}}_2\mathrm{S}$ for that we need to fill in the blank: The electron-group geometry is          . 

Part (b) Step 2: Explanation

${\mathrm{H}}_2\mathrm{S}$ has a tetrahedral electron shape. Because sulfur atom is surrounded by four electrons that form two lone pairs in a tetrahedral configuration.

The electron-group geometry is  tetrahedral        . 

Part(c) Step 1: Given Information

We are given a molecule ${\mathrm{H}}_2\mathrm{S}$ for that we need to fill in the blank: The number of atoms attached to the central $\mathrm{S}$ atom is          

Part (c) Step 2: Explanation

Above is structure of ${\mathrm{H}}_2\mathrm{S}$.

From structure we can see${\mathrm{H}}_2\mathrm{S}$ molecule having central atom $\mathrm{S}$ is attached to two $\mathrm{H}$ atom.

The number of atoms attached to the central $\mathrm{S}$ atom is   two       

Part(d) Step 1: Given Information

We are given a molecule ${\mathrm{H}}_2\mathrm{S}$ for that we need to fill in the blank: The shape of the molecule is          .

Part (d) Step 2: Explanation

The core atom in ${\mathrm{H}}_2\mathrm{S}$ is $\mathrm{S}$, which contains $6$ valence electrons, two of which are taken by two hydrogen to form two bonds and the remaining two pairs remain as lone pairs surrounding the atom, giving it a bent shape due to the lone pair-lone pair repulsion produced by the two pairs of electrons.

The shape of the molecule is   bent       .