Question

The correct order of atomic radii is

(A) Na > Mg > Al > Si

(B) Na > Al > Si > Mg

(C) Si > Al > Mg > Na

(D) Na < Mg < Al < Si​

Answer 1

Explanation:

1. Na has the largest atomic radii as compared to Mg and Al.

The atomic radius decreases when moving from left to right along a period. This is due to an increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size of the atom.

2. Al is least reactive. It has lesser tendency to lose electron due to high effective nuclear charge.