Hydrogen has three isotopes

Question:

Hydrogen has three isotopes $(\mathrm{A}),(\mathrm{B})$ and (C). If the number of neutron(s) in $(A),(B)$ and (C) respectively, are $(x),(y)$ and $(z)$, the sum of $(x)$, (y) an (z) is :

  1. 4

  2. 3

  3. 2

  4. 1


Correct Option: , 2

Solution:

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