Question

How does the valency of element vary
a) in going down a group
b) in going from left to right in a period of the periodic table

Answer 1

i) The valency remains same in going down thegroup.
ii) The valency first increases from 1to 4 and then decrease 4 to 0, in going from left to right in the period of the periodic table. ... Thus, in the modern periodic table, atomic number forms the basis of the classification of elements.

Answer 2

Option b is crct..... In going from left to right in a period of the periodic table