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

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Solution

The correct option is B
13

Mass number is the sum of number of neutrons and protons. So, number of neutrons = Mass number – atomic number. Apply the numbers from the question.You’ll see that ‘Y’ has 13 neutrons.

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

12

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24

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