Question

Gradation in properties in the periodic table with cause

Answer 1

Atomic size increases down the group and decreases across the period.

Reason: The number of shells increases down a group which dominates the effect of increased nuclear charge.

The atomic size decreases across a group because of the increased nuclear charge.

Ionisation potential increases across a period.
It decreases down a group.

Reason : Same as the first reason.

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