Question

i need help with this question​

Answer 1

Explanation:

Valency is the + or - sign number on top of every ion.

MONOVALENT - means valency of +1 or -1

OH-, CL-, NH4+

BIVALENT means valency of +2 or -2

SO3 2-, O2-

POLYVALENT means valency of more than +2 and less than -2, starts from +3 and -3

PO3 3-, Fe3+