Question

Classify cation on basis of their valency :Ca++,Cu++,NH4+,Al+++

Answer 1

valency 1: NH+
VALENCY 2: Cu++ AND Ca++
valency 3: Al+++

Answer 2

on the basis of valency we can categorize cations into
1.Monovalent cation-having one electron in outermost shell like NH4+
2.Divalent cation-having two electron in outermost shell like Ca++ and Cu++
3.Trivalent cation-having three electrons in outermost shell like Al+++