Define atomic number.

Define atomic mass.

Define atomicity .

Define :Atoms

Define atomic mass number.

Define the terms nucleus, nucleons, atomic number, mass number, isotopes, isobars, isotones.

Define isotopes why do isotopes have same atomic number but differente mass numbers? Explain with the help an example.

Define isotopes why do isotopes have same atomic number but differente mass numbers? Explain with the help an example.