Rubidium and cæsium were discovered in this way, rubidium having bright red lines and cæsium a very intense blue line.
The others are all solids, though their melting points vary through wide limits, from cæsium which melts at 26° to elements which do not melt save in the intense heat of the electric furnace.
Others have mentioned Japan and the Corea, but in these countries there are species which it is easy to confound with the one in question, particularly Sium Ninsi and Panax Ginseng.
Sium latifolium, which grew in Blakedown Pools, in Purton’s time, has been long extinct in that locality.
The amount of the oxides of cæsium and rubidium in lepidolite does not generally exceed one-half per cent.
As rubidium and cæsium are more rarely met with in nature than potassium, so also strontium and barium are rarer than calcium (in the same way that bromine and iodine are rarer than chlorine).
The cæsium salts are the most stable, and those of potassium least so, as also those which contain Br and I separately or together; for cæsium no compounds containing Cl and I were obtained.
From this it is clear how the salts of rubidium and cæsium may be isolated.
The chlorides of lithium and sodium give easily soluble double salts with platinic chloride, whilst the chlorides of potassium, rubidium, and cæsium form double salts which are sparingly soluble.
Setterberg obtained cæsium (1882) by the electrolysis of a fused mixture of cyanide of cæsium and of barium.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "sium" in a variety of sentences. We hope that you will now be able to make sentences using this word.
