In 1913, Niels Bohr revised Rutherford's model by suggesting that the electrons ... However, there was still a difference between the atomic number of the atom and the atomic mass.

Atomic Absorption Spectrometers use particular wavelengths of light to evaluate the concentration of gas-phase atoms in a liquid or solid sample. After a solid sample is dissolved in a liquid or a ...

Atoms are made up of sub-atomic particles. Protons are in the _____ of an atom. Their relative charge is _____. The particles that move around outside the nucleus are called _____. Their ...