Chemistry JAMB

What is the valence shell electron configuration of the element with atomic number 17?

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

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