Nucle

Atomic masses are measured in atomic

Atomic masses are measured in atomic mass unit, where 1u = mass of one 12C atom / 12 = 1.660539×10^-27 kg. This unit is convenient because atomic mass

The proton is the nucleus

The proton is the nucleus of the lightest hydrogen atom, which has a relative abundance of 99.985%. It carries one unit of fundamental charge and is s

The neutron is a neutral particle

The neutron is a neutral particle present in nuclei along with protons. Its mass is 1.00866 u = 1.6749×10^-27 kg. A free neutron is unstable and decay

The mass number is given by

The mass number is given by A = Z + N, where Z is the number of protons and N is the number of neutrons.

Isotopes have the same atomic number

Isotopes have the same atomic number Z but different mass number or neutron number. Isobars have the same mass number A. Isotones have the same neutro