Question

define valency. how does it change across a period and on going down a group?

Answer 1

Hiiiii $Aarabh$
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Valency is the combining capacity of an element .
It does not changes across group it remains same.
It increases while moving left to right across a period.
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ANKIT

Answer 2

Combining capacity of an element is called valency..down the grop, valency increases