Question

The atomic mass number of a single element is the __________​

Answer 1

Explanation:

Atomic number, atomic mass, and isotopes

Fundamental properties of atoms including atomic number and atomic mass. The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons.

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Answer 2

Explanation:

The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu