Nonmetallic elements form ions by valence electrons to complete their outer shell.

Non-metals form ions when they gain electrons.

Explanation:

An ion is formed when an atom looses or gains electron.

Metals are the elements which have a tendency to loose electrons and thus they form cations. Example: Sodium will loose 1 electron to form ion.

Non-metals are the elements which have a tendency to gain electrons and thus they form anions. Example: Fluorine will gain 1 electron to form ion.

Hence, non-metals form ions when they gain electrons.

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samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.