Question

In a period, element with least atomic size is ______.

Options

• alkali metal

• halogen

• inert gas

• metalloid

Answer 1

In a period, element with least atomic size is halogen.

Explanation:

Atomic radius decreases from left to right in a period. As a result, atomic size reduces. In this regard, inert or noble gases exhibit unusual behaviour. Their atomic radii are the biggest of their periods.