# Question #be5d9

Jan 4, 2018

A neutral magnesium atom has $12$ electrons.
$\left[N e\right] 3 {s}^{2}$ has a total of $2 + 10 = 12$ electrons (because Neon has $10$).
Therefore, magnesium (Mg) has an electron configuration of $\left[N e\right] 3 {s}^{2}$.