Question

?give me the valency table?

Answer 1

valancie of some common metal elements
lithium-1
sodium-1
potassium 1
silver 1
copper1,2
 mercury 1,2
magnesium2
calcium 2
zinc 2
iron 2,3
aluminium 3

Answer 2

The valency has a pattern as per the periodic table:
1, 0, 1, 2, 3, 4, 3, 2, 1, 0, 1, 2, 3, 4, 3, 2, 1, 0, 1.........
It is as per the 'number' of the elements in the periodic table..........