Write scientific reasons.

Atomic radius goes on decreasing while going from left to right in a period.

Atomic radius goes on decreasing while going from left to right in a period because of the following reasons:

⇒ Within a period, the atomic number increases one by one as a result nuclear charge increases.

⇒ The outer electrons are adding in the same valence shell.

⇒ Due to increased nuclear charge, the attraction of electrons by the nucleus increases.

⇒ Therefore, the size of the atom decreases with the increase in atomic number (number of protons).