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 .

what is the periodic trend in the variation of valency while going dow

1.	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» remains same while GOING down the group..in group 1 -- VALENCY remains 1group 2-- valecy remains 2GROUP 18.. valency remains 0