Question

What is the electron configuration for a phosphorous anion with a charge of $-2$?

Answer 1

Phosphorus:

• Phosphorus is a p-block element having an atomic number $15$ and atomic symbol $\mathrm{P}$.
• It belongs to Group-$15$ and third period.

Electronic configuration of Phosphorus $\left(\mathrm{P}\right)$:

• The electronic configuration of Phosphorus is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^3$.

Electronic configuration of Phosphorus ion $\left({\mathrm{P}}^{2-}\right)$ :

• When Phosphorus $\left(\mathrm{P}\right)$ gains two electrons and results in the formation of Phosphorus ion $\left({\mathrm{P}}^{2-}\right)$.
• The electronic configuration of the Phosphorus ion $\left({\mathrm{P}}^{2-}\right)$ is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^5$.