Question

The number of valence electrons in a magnesium atom is ______________.

Answer 1

The number of valence electrons in a magnesium atom is $2$.

Explanation

• Atomic number of Magnesium ($\mathrm{Mg}$) =$12$
• Electronic configuration =$2,8,2$.
• Therefore, the outermost shell has $2$ electrons. It can easily lose two electrons to complete its octet. So, its valency = $2$.