Exclusion Principle: What is the correct ground state electron configuration of boron, which has 5 electrons?
A. 1s2 2s2 2p
B. 1s2 2s2 2p3
C. 1s2 1p2 2s
D. 1s2 2p2 3s
E. 1s2 2p3
Answer: A
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