Which of the following has smallest radius?

Question

Which of the following has smallest radius? (A) 1s2,2s22p6,3s2 (B) 1s2,2s22p6,3s23p1 (C) 1s2,2s22p6,3s23p5 (D) 1s2,2s22p6,3s23p3

Tardigrade Admin · Accepted Answer

All the elements are of the same periods because all have the equal number of shell. In a period, the size of atom decreases as we from left to right,.i.e., from A to B to D to C. Hence, element corresponding to C is smallest in the size.

Q. Which of the following has smallest radius?

$1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2}$

$1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{1}$

$1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5}$

$1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{3}$

All the elements are of the same periods because all have the equal number of shell. In a period, the size of atom decreases as we from left to right,.i.e., from A to B to D to C. Hence, element corresponding to C is smallest in the size.