I. H = 1s1
II. N = 1s2 2s2 p3
III. O = 1s2 2s2 p4
IV. Zn = 1s2 2s2 2p6 3s2 3p6 4s2 3d10
A. I and II
B. I and III
C. I and IV
D. III and IV
Correct Answer:
Option A – I and II
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