More about isotopes. Atomic mass vs average atomic mass or atomic weight. Atomic Mass. The mass of a specific isotope of an element expressed in atomic mass units (amu) The atomic mass is the total mass of the protons, neutrons and electrons in the atom Atomic mass = mass of an atom
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Atomic mass vs average atomic mass or atomic weight
Symbol of element
This is the number that you see in the periodic table.
This is the weighted average of the all of the isotopes of Hydrogen
weighted average = ( decimal fraction A) mass A + ( decimal fraction B) mass B
Atomic weight = (0.989 * 12) + (0.011 * 13) + (0.00001 * 14) = 12.011
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