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Define atomic number.

The proton/electron number. Found underneath the symbol of an element.

Define atomic mass.

The total number of protons and neutrons in an atom. Found above the symbol of a element.

Define an isotope.
Two or more forms of the same element that have an equal no. of protons but a different no. of neutrons.

Two or more forms of the same element that have an equal no. of protons but a different no. of neutrons.