Possibly the amount of electrons and energy levels in which the electrons reside
it has an electrons in a fixed path together on energy levels.
Answer:
Relative atomic mass or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant is defined as being 1/12 of the mass of a carbon-12 atom.
1.0×10^−15/4.2×10^−7=<span>2.3809524e-23 Hoped I helped!</span>