Niels Bohr: „Thus LEWIS, who in several respects independently came to the same conclusions as Kossel, suggested that the number 8 characterizing the first groups of the periodic system might indicate a constitution of the outer atomic groups where the electrons within each group formed a configuration like the corners of a cube.“(1)

Niels Bohr: „It is to be remarked, however, that such a “static” model of electronic configuration will not be possible if we assume the forces within the atom to be due exclusively to the electric charges of the particles.“(1)

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

Valence theory from Gilbert N. Lewis