Question

2. The order of decreasing atomic radii for Be
Na & Mg is
with explanation
​

Answer 1

Answer:

While going down the group size increases due to the addition of a shell. Therefore, the size of Mg is greater than that of Be.

On moving from left to right in a period size decreases due to increase in nuclear charge. Therefore, the size of Na is greater than that of Mg.

Option A is correct.