Question

Find
(i) The total number of neutrons and
(ii) The total mass of neutron in 7 mg of ¹⁴C.
(Assume that mass of neutron = mass of hydrogen atom)

Answer 1

The mass number of an individual atom is the sum of the protons and the neutrons.

The proton has a mass of approximately 1 amu

The neutron has a mass of approximately 1 amu

The electron has a mass of several orders of magnitude less than 1 amu. The mass of the electrons can be ignored when calculating the total mass of the atom.

p+n=mass