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Question

The sum of the number of neutrons and protons in the three isotopes of hydrogen (1H,2H,3H) 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
Isotopes of Hydrogen are: 11H,21H,31H
Symbol Neutrons Protons
11H 0 1
21H 1 1
31H 2 1
Sum 3 3

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

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