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

The element whose atom has the electronic configuration 2, 8, 3 has atomic number

Single correct option

The element whose atom has the electronic configuration 2, 8, 3 has atomic number
  1. A. 3
  2. B. 11
  3. C. 10
  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. It has three valence electrons and forms Al3+. Mistaking the last shell count for the atomic number gives 3.
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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