Question

The most non-metallic element among the following is :

• A. $1s^2,2s^2,2p^4$
• B. $1s^2,2s^2,2p^2$
• C. $1s^2,2s^2,2p^3$
• D. $1s^2,2s^2,2p^5$

Answer 1

The correct option is D $1s^2,2s^2,2p^5$

The most non-metallic element among the following is $1s^2,2s^2,2p^5$. It represents halogen. In a period, on moving from left to right, the metallic character decreases and the non metallic character increases. In any period, halogen is the most non metallic element.