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Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg. Pt, Ir, Os) or which increase regularly (eg. K, Ru, Cs).

In general, exchange reactions for the lighter isotopes have equilibrium constants sufficiently different from unity, so that the ratios of concentrations of the isotopes in two compounds which are in equilibrium differ by a few per cents in nearly all cases.

During the course of my research, I had had occasion to examine not only simple compounds, salts and oxides, but also a great number of minerals.

The elements which are the most widely diffused have small atomic weights.

Barium, which is commonly found in power plant waste and scrubber wastewater, has been linked to heart problems and diseases in other organs.

Estimates of the ionic mobilities vary over a considerable range; but in any event, the positive ionic defect is much more mobile in the solid than in the liquid, and its mobility varies very little with the temperature.

The body tends to treat elements in the same column of the periodic table as equivalents.

The atoms may be compared to the letters of the alphabet, which can be put together into innumerable ways to form words. So the atoms are combined in equal variety to form what are called molecules.

The noble gases, which reside on the East Coast of the periodic table, are its aristocrats - detached and aloof, never bothering to interact with the rabble of common elements that make up the vast majority of the world.

The most common and most important result of them is that the nature and size of the effect on corresponding series of different elements are largely an expression of the peculiarity of their atomic structure - or, at least, of the structure of the surface.