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Question

What is the difference between the number of neutrons of 21H and 31H?

A
1
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B
2
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C
3
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D
0
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Solution

The correct option is A 1
A
1H2
Mass number : 2
Change number : 1
It has one electron, one proton and one neutron.

1H3
Mass number : 3
Change number :1
It has one electron, one proton and two neutrons.
So the difference is 1.

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