Question

Which atom (X) is indicated by the following configuration?
$X\to \left[Ne\right]3s^{2}3p^3$

• A. Nitrogen
• B. Chlorine
• C. Phosphorus
• D. Sulphur

Answer 1

Answer: (C)

Phosphorus

Given electronic configuration of X: $\left[Ne\right]3s^{2}3p^3$

where [Ne] is $1s^{2}2s^{2}2p^6$

thus X is: $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$

Its an element with atomic number (2+2+6+2+3)=15

It is Phosphorus (P)=X