Question

Select the number of electrons each atom must gain or lose to have a full valence level. Use the periodic table if you need help.

A calcium atom (Ca) will
A fluorine atom (F) will
A lithium atom (Li) will
An argon atom (Ar) will
An aluminum atom (Al) will

Answer 1

A calcium atom (Ca) will lose 2 electrons → Ca2+
A fluorine atom (F) will gain 1 electron → F-
A lithium atom (Li) will lose 1 electron → Li+
An argon atom (Ar) will neither gain nor lose electrons (0) → Ar (already full)
An aluminum atom (Al) will lose 3 electrons → Al3+