The sum of the number of neutrons and protons in the three isotopes of hydrogen $(^{1} H,^{2} H,^{3} H)$ is:

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Solution

The correct option is A 6
Isotopes of Hydrogen are: $_{1}^{1} H,_{1}^{2} H,_{1}^{3} H$

Symbol Neutrons Protons

$_{1}^{1} H$ 0 1

$_{1}^{2} H$ 1 1

$_{1}^{3} H$ 2 1

Sum 3 3

Therefore, sum of neutrons and protons in the isotopes of hydrogen = 6

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