1.

Think about it, What is the periodic trend in the variation of valency while going down a group? Explain the answer with reference to group 1, group 2 and group 18.

Answer»

Solution :(i) 1 A 1 the elements in a group have the same NUMBER of electrons in the OUTERMOST shell. Therefore,down the grorp, VALENCY remains the same.
(ii) Valency of group 1 elements is 1 and that of group 2 elements is 2.
(III) Th e valency of group 18 elements is zero because they are noble gases with COMPLETED outermost shell.


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