Engineering Board Exam Reviewer · Chemistry · medium

What is the electron configuration of sodium (Z = 11)?

1. 1s2 2s2 2p7
2. 1s2 2s2 2p6 3p1
3. 1s2 2s2 2p6 3s1
4. 1s2 2s8 3s1

Answer

C. 1s2 2s2 2p6 3s1

Solution

2 + 2 + 6 + 1 = 11 electrons.

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