On the constitution of atoms and molecules

by Niels Bohr

These values are of the order of magnitude to be expected. For

we get

, which corresponds to

; the value for the ionizing potential of a hydrogen atom, calculated by Sir J. J. Thomson from experiments on positive rays, is

[30]. No other definite data, however, are available for hydrogen atoms. For sake of brevity, we shall in the following denote the values for