Question

In any period, the atomic size of ___________ element is exceptionally larger than its predecessor. (if Noble gases are not considered)

• A. first
• B. second
• C. third
• D. fourth

Answer 1

The correct option is A first

The last element in every period is inert gas. In any period, the first element has its valence electron now entering into a new energy level which is unfilled in case of preceding inert gas. Due to increase in the shell compared to the preceding element, the first element now has more atomic radii ( atomic size) exceptionally.