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Modern Periodic Law

Atomic number...

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 $= 25 - 12 = 13$ .

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