Question

what is the periodic trend in the variation of valency while going down a group? explain your answers with reference to group 1 , group 2 and group 18 .

Answer 1

valency remains same while going down the group..
in group 1 -- valency remains 1
group 2-- valecy remains 2
group 18.. valency remains 0

Answer 2

Answer:

Explanation:

(i) All the elements in a group have the same number

of electrons in the outermost shell. Therefore,

down the group, valency remains the same.

(ii) Valency of group 1 elements is 1 and that of group

2 elements is 2.

(iii) The valency of group 18 elements is zero because

they are noble gases with completed outermost

shell.