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By B. S Hopkins

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The differences between the two divisions of Group I may be summarized as follows: (1) The important, possibly the only, valence in the A division is I, while the most common valence of copper is 2 and in the most, stable compounds of gold the metal has a valence of 3. (2) The alkali metals are the most active metals that we* have, standing at the head of the ICleetromotive Series and displacing all other metals from their combinations. They are easily and quickly oxidized in the air. On the other hand the members of Division B are among the least active of our metals, silver and gold remaining untarnished in the air, while copper oxidizes slowly; these metals are at the foot of tho Electromotive* Series, being displaced from solutions by nearly all other metals.

If nitrogen is present it also may be removed by cooled clmmml, since it is more? readily absorbed than either neon or helium. Properties. — Noon resembles helium closely, but shows n greater variation from the expected values than any other member of the family. 0002 grams under normal conditions. 2. 0, much below that of helium and the lowest for any gas. Thin value in materially raised by the presence of impurities; consequently, the purity of any sample of neon may be judged by tlit* determination of this constant.

Rubidium may be extracted from lepidolite by decomposing the finely ground mineral with calcium fluoride and sulfuric acid; heat, then extract with water, evaporate, and allow the caesiurn-rubidium alums to crystalline. Another method may be UHIHI to recover rubidium ntul caesium from any silicate ore. Tfeat the finely ground mineral with CaCl2 and N i l / 1 ! , cool, and extract with water. Kvnp~ orate, add H2KO4, filter off CaHO4, and add ( N H 4 ) 3 C ( ^ Miter and precipitate caesium-rubidium ehloroplat mates.

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Chemistry of the Rarer Elements by B. S Hopkins

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