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Question

Atomic number of Y=12. Its mass number is 25. How many neutrons are present in the nucleus of Y?


A

37

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B

13

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C

11

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D

12

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Solution

The correct option is B

13


Mass number of an atom = number of neutrons + number of protons.
So, the number of neutrons = Mass number – atomic number.
i.e., number of neutrons =2512=13.


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