Question

Describe the electronic configuration of Na⁺, mg²⁺ and Al³⁺. Do they have same number of electron in the outermost shell?

Answer 1

Step-by-step explanation:

All 3 of these elements are in Period 3 of the Periodic Table.

Na is in Group 1 (alkali metals) and has a total of 11 electrons; 1 valence electron.

Mg is in Group 2 (alkaline earth metals) and has a total of 12 electrons; 2 valence electrons.

Al is in Group 13 and has a total of 13 electrons; 3 valence electrons.

Valence electrons are in the outermost shell.