Periodic Table — Easy JEE chemistry MCQ
Which of the following has the smallest atomic radius?
- A. N
- B. O
- C. C
- D. B
Solution
Atomic radius decreases across a period (left to right). In period 2: B > C > N > O. But N has higher nuclear charge than C with similar shielding. Among B, C, N: N is smallest due to higher $Z_{eff}$.
Actually O < N < C < B. So **B. O** is smallest. Let me correct: The answer is **B**.