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

What is the valence shell electron configuration of the element with atomic number 17?
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  • A 1s2 2s2 2p6 3s2 3p4
  • B 1s2 2s2 2p6 3s2 3p5
  • C 2s2 2p6
  • D 3s2 3p5
Correct Answer: Option B
Explanation:

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