Atomic mass Summary

Atomic Mass and Weight The atomic mass of an atom (i.e., a specific isotope of an element) is measured in comparison with the mass of one atom of carbon-12 (12C) that is assigned a mass of 12 atomic m... Read more

Atomic Weight/Mass The atomic mass of an element is the mass of the number of particles in its nucleus given in atomic mass units. Although it is sometimes referred to as atomic weight, this is inaccu... Read more