Abstract
American Journal of Science, May.βOn the colour relations of atoms, ions, and molecules, by M. Carey Lea. Part I. The colour or absence of colour of an element is a function of its atomic weight. No element having ions coloured at all valencies can belong to the same natural group with elements having colourless ions only. The entire class of elements with colourless ions is divided into nine great natural groups, as follows:β H, F, C1, Br, I; Li, Na, K, Rb, Cs: Ca, Sr, Ba; Sc, Y, La; Be, Mg, Zn, Cd, Hg; B, Al, Ga, In; C, Si, Ge, Sn, Pb, Th; N, P, As, Sb; O, S, Se, Te. This first great division of the elements includes all those whose ions function as anions, and also part of the cathions.
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Scientific Serials. Nature 52, 118 (1895). https://doi.org/10.1038/052118a0
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DOI: https://doi.org/10.1038/052118a0