Question

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Ques32 why does size of atom increase down the group?
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Answer 1

Answer:

Ques32 why does size of atom increase down the group?

Answer 2

Answer:

general, atomic radius decreases across a period and increases down a group.

Across a period, effective nuclear charge increases as electron shielding remains constant.

A higher effective nuclear charge causes greater attractions to the electrons, pulling the

electron cloud closer to the nucleus which results in a smaller atomic radius.

Down a group, the number of energy levels (n) increases, so there is a greater distance between

the nucleus and the outermost orbital. This results in a larger atomic radius.