Chapter 11, Problem 8STP

Interpretation Introduction

Interpretation:

The subshell in which the valence electrons of elements labelled as W are present needs to be determined.

Concept introduction:

A tabular arrangement of the chemical elements by their atomic number in such a way that the elements with same number of valence shell electrons are present in the same vertical columns called groups. The horizontal rows are known as periods. The complete tabular form of elements is known as the Periodic Table.

Answer to Problem 8STP

The correct option is (b), p.

Explanation of Solution

Reason for correct option:

The electrons present in the outermost orbital of highest principal energy level are said to be valence electrons. The possible orbitals are $\text{s, p, d and f}$.

In periodic table, the elements are arranged in increasing atomic number and the elements in the same group have similar chemical and physical properties. The valence electrons of group 1 and 2 elements is in $\text{s}$ -orbital, elements in group 3-12 have valence electrons in their $\text{d}$ -orbital and elements in group 13-18 have valence electrons in $\text{p}$ -orbital.

The elements labeled W are present in group 13-18 so, the valence electrons are present in $\text{p}$ -orbital.

Conclusion

Reason for correct options:

The elements labeled Y are present in group 1-2 so, the valence electrons are present in $\text{s}$ -orbital.

The elements labeled Z are present in group 3-12 so, the valence electrons are present in $\text{d}$ -orbital.

The elements labeled X have the valence electrons in $\text{f}$ -orbital.