Mass Number = total no. of protons & neutrons in nucleus of atom
Atomic number = no. of protons in an atom
Nucleons = protons, neutrons & anything in the nucleus of an atom
Ion = charged particle due to the gain/loss of electrons
Isoelectronic = such all with the same electron configuration as each other
Isotope = atoms of the same element but with different no. of neutrons and the same no. of protons