the mass number most similar to the average mass of all isotopes of the element.
mass number
Since many elements have a number of isotopes, and since chemists rarely work with one atom at a time, chemists use average atomic mass.
- The total mass of atoms in an element is represented by its mass number (i.e protons, electrons, and neutrons).
- If you look at a periodic table element square, the mass number is the number above the element letter, and the atomic number is the number below.
- For example, the mass number of Oxygen (O) on a periodic table is 16.0.
- The mass number of an isotope is its atomic mass.
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