An atom has mass number A and atomic number Z.
How many neutrons are present in its nucleus?

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Solution

Atomic number(Z)- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
Mass number(A)- The number of protons and neutrons combine to give us the mass number of an atom.
Neutrons are neutral subatomic particles present in the nucleus of an atom.
Mass number= number of protons(atomic number) + number of neutrons.
We get the number of neutrons by subtracting the atomic number from the mass number.
Hence, Number of neutrons will be Mass number(A) - Mass number(Z).

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