Post-UTME Chemistry 2018 Objective — Question 7
Question 7 of 21 from the Post-UTME Screening (Post-UTME) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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Which of the following is the electronic configuration of sodium? (Atomic number of Na = 11)
- A. 1s2 2s2 2p6 3s1Correct
- B. 1s2 2s2 2p6 3s2 3s1
- C. 1s2 2s2 2p6 3s1 (duplicate)
- D. 1s2 2s2 2p6 3s0
Explanation
Sodium (Z=11) has electron configuration 1s2 2s2 2p6 3s1 (2+2+6+1=11 electrons).
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