An atom's atomic number is usually greater than its mass number.

Name: An atom's atomic number is usually greater than its mass number.
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The atomic number of an atom is equal to the number of protons in its nucleus, while the mass number is the sum of the number of protons and neutrons in the nucleus. Since the number of protons is always less than or equal to the sum of protons and neutrons, the mass number of an atom is usually greater than or equal to its atomic number.

An Atom's Atomic Number Is Usually Greater Than Its Mass