Question

question 10 (1 point)
what is the atomic mass of an element?
the mass number
the weighted average atomic mass of all isotopes of an element
the atomic number
the number of electrons

Explanation:

Atomic mass is the weighted - average mass considering different isotopes and their abundances. Mass number is for a single isotope, atomic number is number of protons, and number of electrons is not atomic mass.

Answer:

The weighted average atomic mass of all isotopes of an element