Question

The element with atomic number 17 has the least size among all the elements of that period.

• A. True
• B. False

Answer 1

The correct option is A True

1. Atomic size in a period decreases from left to right due to the increase in the effective nuclear charge as the electrons enter into same shell.
2. In third period, among Na, Mg, Al, Si, P, S, Cl - Cl is present at the extreme right side of the period. so, it has least size.

Hence, the statement is true.