Electronegative Ions

Bivalent Electronegaive ions
A Radical or Ion which is formed by gaining of two electrons is called Bivalent Electronegaive ions

Trivalent Electronegaive ions
A Radical or Ion which is formed by gaining of three electrons is called Trivalent Electronegaive ions.

Tetravalent negative ions:
A radical formed by gaining 4 electrons is called  tetravalent negative ions.