By B. S Hopkins
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Additional info for Chemistry of the Rarer Elements
Niton in probably present in nil nulioaetive minerals, but always in infinitesimal amounts. Sinn* it dinintegrates rather rapidly, it is always a transition produet, in equilibrium with the radium present. Since thin element in itself present in very small amounts, the quantity of niton in any mineral must be exceedingly small. The presence of a radioactive gas in tho atmonptu're* linn b<»c»n demonstrated 3 by the* simple exposure of a nc^utively e l m w d wire. , and thorium A, thorium B, thorium C, etc.
Chmn, » 60S (1B09). LITHIUM 'W the hydrogen even if the water is boiling. When heutcd in fh<* air, lithium burns quietly with a bright whifr litfht, yielding Li2O, and at red heat it unites readily with hydrogen, forming LiH, which is quite stable. It unites also with nitn^cn, fanning LigN, and burns when heated in chlorine, bromine, imlim% sulfur vapor, or dry carbon dioxide. Dilute nulfuric and hydrochloric acids dissolve the metal readily, but r o n m i f m i r d sulfuric acts more slowly. Nitric acid attacks lithium HO violently that the metal usually melts and often ignites.
It has greater affinity for oxygen tttitn does potassium, since it takes fire spontaneously in the nirf giving an oxide, probably a mixture of lif^O and HbO». I t reacts vigorously with water, yielding UbOII. The atom Inw two isotopes of atomic weight 85 and 87 which are found irt proportion 3 : L Compounds of rubidium resemble thonn of fmtumimn, with 52 GROUP I LITHIUM, RUBIDIUM, CAESIUM which they are isomorphous.