Question

Valency of all elements from 1to40

Answer 1

Answer:

I think you know that valency of the elements depending upon the it's atomic no. and group no.

the elements present in 1st group of periodic table have 1 valence electron in its outermost shell and as we go right of the periodic table the no. of valence electrons increases and at last ,in the group 18 the no more valence electron remains because the outermost shell can have only 8 electrons (upto 20 elements) or 18 electrons. therefore these elements are called stable elements