Calculate the number of neutrons present

Question:

Calculate the number of neutrons present in the nucleus of an element ${ }^{31}{ }_{15} \mathrm{X}$ which is represented as.

Solution:

Mass no. of the element (A) $=31$

Atomic no. of the element $(Z)=15$

No. of neutrons $(n)=A-Z=31-15=16$.

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