Question

Largest atom among the following is
(A) F9)
(B) C19)
AN
(D) 19
(C) Br (9)​

Answer 1

Answer:

Potassium, silicon and calcium belong to third period

Explanation:

For elements of same period size decreases while going from left to right in a period due to increase in Z-effective. Increase in Z-effective results in contraction of size. While going down the group, size of element increases due to addition of a shell. Thus, size of potassium is greater than that of sodium. So, potassium has the largest radius.