Question

atomic size and variation along a period and group​

Answer 1

Answer:

Atomic size decreases across a Period from left to right as we face the Table, but INCREASES down a Group, a column of the Periodic Table. ... And thus across the Period nucular charge predominates, and draws the valence electrons towards the nuclear core, with the result of a marked decrease in atomic radius.

Answer 2

Answer:

Atomic size decreases along a period from left to right due to increase in the nuclear charge which is measured in picometer.

Atomic size increases from top to bottom in a group due to increase in their orbit