Question

easy way to learn valency.

Answer 1

Read electronic configuration and find a pattern but first of all you have to learn periodic table.

Answer 2

If you have a periodic table with you, try to locate the elements you know already, and their valencies.

You'll notice that sodium, potasssium and hydrogen have a valency of 1 and are both in group 1.

Group II elements will have valencies of 2. Group III, valencies of three. Group IV valencies of 4.

However, group V will have valencies of 3, group VI valencies of 2, group VII valences of 1 and group VIII or 0 valency of zero.

by doing practice you will learn.