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What is the ground state configuration of sodium (Z = 11)?
A1s2 2s2 2p5 3s2
B1s2 2s2 2p6 3s1
C1s2 2s2 2p6 3d1
D1s2 2s2 2p6 3p1
Answer & Solution
Correct answer: B. 1s2 2s2 2p6 3s1
Sodium has eleven electrons: neon core of ten plus one in 3s.
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