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NDA 2016 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · easy

The number of neutrons in an atom of tritium (³₁H) is

Single correct option

The number of neutrons in an atom of tritium (³₁H) is
  1. A. 1
  2. B. 3
  3. C. 2
  4. D. 0
Show answer and solution

Answer: (C) 2

Tritium has mass number 3 and atomic number 1. The number of neutrons = mass number − atomic number = 3 − 1 = 2. Protium has no neutron and deuterium has one. The trap is to confuse the mass number with the neutron count.
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Original question written in the NDA 2016 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