The atomic number of an element is the number of ____ in the nucleus of an atom. The atomic number is also the number of ____ that orbit the nucleus of an atom. The ____ is the total number of protons and neutrons in the nucleus of one atom. Some atoms have the same number of protons but a different number of neutrons, these are called ____. Isotopes have the same ____ but a different mass number.

Isotopes

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