ELECTRONEGATIVE IONS

 ELECTRONEGATIVE IONS
Monovalent negative ions:A radical formed when an atom gains one electron is called monovalent  negative ions.

Illustration 2:  If in an element X there are seven electrons present in its outer most orbit then it is a ......................
Solution :     it is an example of halogens , X=9
electronic configuration = 1s²2s²2p⁵
It is a flourine and  non metal 
Bivalent Electronegaive ions
A Radical or Ion which is formed by gaining of two electrons is called Bivalent Electronegaive ions