Assume a certain element Y contains one more proton and two more neutrons than protium. Then the mass number of element Y will be
A
3
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B
2
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C
4
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D
5
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Solution
The correct option is C 4 Protium contains one proton and zero neutrons. Therefore, element Y will contain two protons and two neutrons. So the mass number of the element Y will be 2 + 2 = 4.