Question

Which of the following is the atomic number of metal?

• A. $32$
• B. $34$
• C. $36$
• D. $38$

Answer 1

The correct option is D $38$

Elements having $1,2$ or $3$ electrons in its last shell act as metals.

$32=\left[Ar\right]3d^{10}4s^2{p}^2$

$34=\left[Ar\right]3d^{10}4s^2{p}^4$

$36=\left[Ar\right]3d^{10}4s^2{p}^6$

$38=\left[Ar\right]3d^{10}4s^2{p}^6,5s^2$

In the above electronic configuration, the last electron enters into $5s$ orbital, hence it is an alkaline earth metal.

Thus option D is correct.