Question

An element x(2,8,2) combines separately with no 3 -, so 4 2- and po 4 3- ions.Write the formulae of the three compounds so formed to which group of periodic table does this element belong?

Answer 1

element has +2 valency
group 2nd has +2 valency elements therefore it belongs to 2nd group.

with NO3-
X(NO3)2-

with (SO4)2-
XSO4

with (PO4)3-
X3(PO4)2-

hope it helps you