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Hydrogen has three isotopes (A),(B), and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x),(y) and (z)  is :
Option: 1 4
Option: 2 3
Option: 3 2
Option: 4 1

Answers (1)


As we have learnt,

Hydrogen has 3 isotopes. And these isotopes differ from each other because of presence of different number of neutrons.

  1. Protium, ^{1}_{1}H
  2. Deuterium, ^{2}_{1}H or D
  3. Tritium, ^{3}_{1}H or T

Number of neutrons in Protium is 0.
Number of neutrons in Deuterium is 1.
Number of neutrons in Tritium is 2.

Thus, the correct answer is 0+1+2=3

Therefore, Option(2) is correct.

Posted by

Kuldeep Maurya

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