Question

An element belongs to group $15$ and third period of the Periodic Table. Its electronic configuration will be :

• A. $1s^{2}2s^{2}2p^3$
• B. $1s^{2}2s^{2}2p^4$
• C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
• D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^2$

Answer 1

Answer: (C)

$1s^{2}2s^{2}2p^{6}3s^{2}3p^3$

All Group 15 elements have the electron configuration $n{s}^{2}n{p}^3$ in their outer shell, where n is the principal quantum number.

Thus, with electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$, the element is phosphorus.

Hence, option $C$ is correct.