Question

atomic radius goes on decrease in a period from left to right, why give the perfect reason! and in group from top to bottom goes on increase why give the perfect reason ​

Answer 1

Explanation:

a) atomic radius decreases across period from left to right

EXPLANATION: across a period with increase in atomic no. , the no. of electrons increases but no. of shell remain the same due to which electrons fill in same shell which in in turn increase the nuclear force of attraction between nucleus and electrons of outermost shell and atomic size decreases

b) atomic radius increases from top to bottom

EXPLANATION: in a group, from top to bottom with increase in atomic no. the no.of shells also increase due to which electron in outer shell of each succeeding element lie farther and farther away from nucleus

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Answer 2

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