Question

what is the easy way to memorize valencies....

Answer 1

learn the atomic number of elements And from Hydrogen start it in this pattern
1 0 1 2 3 4 3 2 1 0 1 2 3 4 3 2 1 0 ............

and continue the series according to the atomic number sequence and in this pattern.

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Answer 2

if you know the atomic number of the elements properly then you can take out the valency also...for example ..alluminium has atomic number 13 so ...the electronic configuaration of Al is 2,8,3 ...as the outer most shell has 3 electrons the valancey is 3