# Question #c796f

May 1, 2017

10

#### Explanation:

Element 13 with 13 protons is Aluminum. To become stable Al will lose its three valance or outmost electrons. leaving the atom with a +3 charge

Aluminum starts with 13 protons and 13 electrons. Its electron configuration is $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}$

When Aluminum loses its third level electrons $3 {s}^{2} 3 {o}^{1}$ it i left with the electron configuration of Neon $1 {s}^{2} 2 {s}^{2} 2 {p}^{6}$ which is stable. This configuration has 10 electrons.

Another way to solve the problems is by subtraction. Aluminum starts with 13 electrons and loses 3 electrons.

$13 - 3 = 10$

Aluminum as a $3 +$ ion will have 10 remaining electrons.