Niels Bohr: “LANGMUIR, who has attempted … to account not only for the occurrence of the first octaves, but also for the longer periods of the periodic system, supposes therefore the structure of the atoms to be governed by forces whose nature is unknown to us..“(2)

Niels Bohr: „He conceives the atom to possess a “cellular structure,” so that each electron is in advance assigned a place in a cell and these cells are arranged in shells in such a manner, that the various shells from the nucleus of the atom outward contain exactly the same number of places as the periods in the periodic system proceeding in the direction of increasing atomic number.“(2)

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(2) The Theory of Spectra and Atomic Constitution THREE ESSAYS by BY NIELS BOHR CAMBRIDGE AT THE UNIVERSITY PRESS 1922