Question

Give scientific reason Atomic size decreases from the left to right in the periods and increases down the group​

Answer 1

Answer:

Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.

Explanation:

Answer 2

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase,and As you move across a period, atomic radius decreases.