Question

Number of neutrons in an atom can be determined by

Answer 1

HEY......

The number of electrons in a neutralatom is equal to the number of protons. The mass number of the atom(M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass numberof the atom (M) and the atomic number (Z).

Answer 2

if we know the electron number of the atom you can find the proton number as the rule say the charge are equal and the same number of proton and electron will cancel there charge to become an neutral atom.

and if we know the nucleus number you can minus the nucleus number from the proton number to get the neutron number of the atom.