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NDA 2024 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · easy

The number of neutrons in the nucleus of the sodium atom ²³₁₁Na is

Single correct option

The number of neutrons in the nucleus of the sodium atom ²³₁₁Na is
  1. A. 12
  2. B. 11
  3. C. 23
  4. D. 10
Show answer and solution

Answer: (A) 12

Number of neutrons = mass number - atomic number = 23 - 11 = 12. The number 11 is the count of protons, which is also the number of electrons in the neutral atom. The number 23 is the total of protons and neutrons.
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Original question written in the NDA 2024 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