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# Calculate the number of neutrons present in the nucleus of an element X which is represented as ^{31}X_{15}

Mass number (A) = No. of protons (Z) + No. of neutrons

**Given,**mass number = 31

No. of protons = 15

No. of protons (Z) + No. of neutrons = 31

No. of neutrons = 31 – number of protons

No. of neutrons = 31 – 15 =

**16.****Hence, the No. of neutrons =16.**

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