Question

Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is(a) M – Z(b) M(c) Z(d) M + Z

Answer 1

the answer will be M - Z because atomic number is equal to the number of proton and atomic mass is the sum product of the proton and neutron

in order to find out the number of neutron in an atom will be atomic mass minus atomic number.