Question

What is the valence of Na,Mg,Ca and Al

Answer 1

Answer:

Na=1

Mg=2

Ca=2

Al=3

Explanation:

Na=Sodium is a group I element so it has one outer electron.To obtain a noble gas configuration, it has to lose 1 electron. So its valence is 1.

Mg & Ca= Magnesium and Calcium are group II elements so it has two outer electrons. To obtain a noble gas a noble gas configuration it needs to lose two electrons. So the valence is 2.

Al=Aluminium is a group III element so it has three electrons in the outer electrons which means it's valence is three.