A. 1s2 2s2 2p6 3s2 3p4

B. 1s2 2s2 2p6 3s2 3p5

C. 2s2 2p6

D. 3s2 3p5

Correct Answer:

Option B – 1s2 2s2 2p6 3s2 3p5

Copyright warnings! Do not copy.