All atoms are treated as point particles with atomic masses according to their atom types (H, C, N, and O).
The atomic masses for individual atoms must be calculated by taking into account the exact number of protons and neutrons in a single atom.
The monoisotopic mass of an ion is the sum of its atomic masses using the most abundant isotope for each of its atoms.
The availability of atomic masses is very important to chemists.
The relative constancy of the isotopic abundances makes it possible to tabulate meaningful average atomic masses for the elements.
On the practical level, Faraday did for charge what Dalton had done for the chemical combination of atomic masses.
The research, the Marijuana Signature Project, relies on stable isotopes, which are forms of an element like nitrogen or oxygen, that have distinct atomic masses.
It is convenient to divide the naturally occurring isotopes into families on the basis of the relationships of their atomic masses to each other.
A few years later, Soddy published a comparison of the atomic masses of the stable element lead as measured in ores rich in uranium and thorium, respectively.
In this way the rate constant of a chemical or physical process may be expressed in terms of atomic and molecular dimensions, atomic masses, and interatomic or intermolecular forces.
A major difficulty with this hypothesis, among various other problems, is that atomic masses 5 and 8 are unstable, and there is no known way to build heavier nuclei by successive neutron capture.
