Answer :
Metals of Group 1 donate 1 electron from its ns orbital to form ionic bond, where n is the no. of its outermost shell.
Metals of Group 2 donate 2 electrons from its ns orbital to form ionic bond, where n is the no. of its outermost shell.
Metals of Group 2 donate 2 electrons from its ns orbital to form ionic bond, where n is the no. of its outermost shell.