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Question

The sum of the number of neutrons and protons in the isotopes of hydrogen is:

A
6
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B
5
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C
4
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D
3
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Solution

The correct option is A 6
In tritium nucleus there is one proton and 2 neutrons
n+p=3
In deuterium nucleus there is one proton and one neutron
n+p=2
In protium nucleus there is one proton and no neutron
n+p=1
Total =3+2+1=6

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