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NDA 2021 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · easy

The atomic number of an element whose electronic configuration is 2, 8, 3 is

Single correct option

The atomic number of an element whose electronic configuration is 2, 8, 3 is
  1. A. 3
  2. B. 11
  3. C. 27
  4. D. 13
Show answer and solution

Answer: (D) 13

Atomic number equals the number of electrons in a neutral atom: 2 + 8 + 3 = 13, which is aluminium. The valence electrons number only 3, which is a trap, while 11 corresponds to sodium (2, 8, 1).
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Original question written in the NDA 2021 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