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