A. 1s2 2s2 2p3
B. 1s2 2s2 2p6 3s2 3p1
C. 1s2 2s2 2p4
D. 1s2 2s2 2p6 3s2 3p6 4s2 3d1
Correct Answer: 1s2 2s2 2p6 3s2 3p1 ✔
Last Updated: February 11, 2021
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