Question

The electronic configuration $1s^2,2s^2,2p^6,3s^1$ and $3p^1$ is correctly describe by

• A. The excited state of $M{g}^{+}$
• B. The excited state of $N{a}^{+}$
• C. The excited state of Mg
• D. The excited state of Al

Answer 1

Answer: (A)

Atomic number of $Mg=12$. It has $12$ electrons.
$\therefore \underset{121}{\mathrm{Mg}}\stackrel{-1}{\to }\underset{111}{M{g}^{+}}$
So it is excited state of $M{g}^{+}$