Question

what happens when aluminum fills its valence shell?
three electrons are lost, creating al⁻³.
three electrons are gained, creating al⁻³.
three electrons are lost, creating al⁺³.
three electrons are gained, creating al⁺³.

Explanation:

Aluminum is a metal with 3 valence electrons. Metals tend to lose electrons to achieve a stable electron - configuration like a noble gas. When aluminum loses its 3 valence electrons, it forms a cation with a +3 charge.

Answer:

C. Three electrons are lost, creating $\text{Al}^{+3}$