The Rutherford–Bohr model
of the hydrogen atom
(Z = 1
) or a hydrogen-like ion (Z > 1
). In this model it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron jumps from one orbital to another, be proportional to the mathematical square of atomic charge (Z2
). Experimental measurement by Henry Moseley
of this radiation for many elements (from Z = 13 to 92
) showed the results as predicted by Bohr. Both the concept of atomic number and the Bohr model were thereby given scientific credence.