Question

depending on electronic configuration the properties of elements vary in different periods . explain why

Answer 1

because properties of elements basically depend upon valency of element and along period valency increases first and then decrease as a result properties of elements vary along period

Answer 2

hey,
here's ur answer,
properties of elements depend upon their valancy n different periods have different valancy . It may be electropositive or negative .in this way different periods have
different properties.
hope it will be helpful.