Question

The atomic number and mass number for a specimen are z and a respectively.the number of neutrons in the atomic will be

Answer 1

Hy!!

Since Atomic Number of any specimen is equal to number of protons.

Hence Z = Number of protons .. Eq 1.

And

Mass Number is equal to sum of protons and neutrons (Number of nucleons in nucleus).

Hence A = Number of protons + Number of neutrons.. Eq 2.

Put eq 1 in eq 2.

=) A = Z + Number of neutrons

=) A- Z = Number of neutrons..

Hope it's helpful to u.