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Which best describes the definition for the atomic mass of an element?


It is a weighted average of the masses of an element’s isotopes.

It is a ratio based on the mass of the carbon-12 atom.

It is the sum of the protons and neutrons in one atom of the element.

It is twice the number of protons in one atom of the element.

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quasarJose

Answer:

It is a weighted average of the masses of an element’s isotopes.

Explanation:

The best definition of the atom mass of an element is that it is a weighted average of the masses of an element's isotopes.

  • Isotopes of an element have the same electronic configuration but differ in only their masses.
  • The atomic mass of an element can be derived from the geonormal abundances of this isotopes.
  • It is the average of all the isotopes of an element.

 Atomic mass  = ∑m[tex]_{i}[/tex] a[tex]_{i}[/tex]

where m[tex]_{i}[/tex] is the mass of the isotope i

            a[tex]_{i}[/tex] is the abundance of the isotope i

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