Chapter 7, Problem 18STP

Interpretation Introduction

Interpretation:

The transition metal from the given elements needs to be identified.

Concept introduction:

The valence electronic configurations of d-block or transition elements can be written as $\left(\text{n}-1\right){\text{d}}^{1-10}{\text{ns}}^{1-2}$, here n refers to the elements period and its principal energy level.

Answer to Problem 18STP

B. Chromium is the transition metal.

Explanation of Solution

Reason for correct option:

B. The elements present in group 3 to 12 are d-block elements or transition elements. Chromium is present in group 6 and electronic configuration is $\left[\text{Ar}\right]{\text{3d}}^{\text{5}}{\text{4s}}^{\text{1}}$. Thus chromium is the transition metal.

Conclusion

Reason for incorrect option:

1. Sodium is present in group 1.
2. Boron is present in group 13.
3. Argon is present in group 18.
4. Chlorine is present in group 17.