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Railways PYQCBT 1 2016

RRB NTPC · Question 8

How many valence electrons does an oxygen atom have? A. 2 B. 6 C. 8 D. 16

  1. A

  2. D

  3. C

  4. B

Show answer & explanation

Answer: (D) B

Explanation

Oxygen (atomic number 8) has the configuration 2, 6, so it has 6 valence electrons and needs 2 more to complete its octet.