Question

Elements group 1 and 7 both have valency 1. Explain

Answer 1

Answer:

The elements of the group 1 and 7 , both have valency 1 because-:

➡In case of 1 group, the elements are metals and they need only 1 electron to be given to another element in order to achieve nobel gas configuration.

➡In 7 group of elements, the elements need to gain 1 electron to acquire the noble gas configuration.

➡Thus, these both have valency=1