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NDA 2022 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · easy

The number of valence electrons in an atom of chlorine (atomic number 17) is

Single correct option

The number of valence electrons in an atom of chlorine (atomic number 17) is
  1. A. 1
  2. B. 8
  3. C. 17
  4. D. 7
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Answer: (D) 7

Chlorine has the configuration 2, 8, 7, so the outermost shell holds 7 electrons. It needs one more electron to complete an octet, which is why it forms the Cl- ion. The number 17 is the atomic number, not the valence count.
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Original question written in the NDA 2022 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake