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geochemical equilibria 474 differentiation of most elements was controlled by
their electronic configurations. These processes probably occurred when the
Earth was hotter than it is now; the resulting lower viscosity would have allowed
geochemical model, mathematical simulations of the behaviour of chemical
elements within the Earth and its components. The models usually consist of
reservoirs, which represent relatively homogeneous (with respect to the element
-charactcristics and use 13:976e group (geology): see rock-stratigraphic units.
group, in chemistry, a set of chemical elements in the same vertical column of the
periodic table. The elements in a group have similarities in the electronic ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review