Element Calcium, Ca, Alkaline Earth Metal. The element also takes part in the most varied way in the building up of the organisms. Calcium has also been found in meteorites, and by spectral analysis in the sun and fixed stars.

Element Magnesium, Be, Alkaline Earth Metal. Magnesium bears the same relation to calcium as sodium does to potassium. This relation finds expression not only in the values of the combining weights, but also in the similarities to the other members of the group. This is particularly well seen in the fact that magnesium. Is now manufactured in very large amount by electrolysis, and is used for various purposes. It is a white, rather tough metal, which keeps fairly well in the air; it is scarcely attac.

Element Rubidium, Rb, Alkali Metal. During their investigations they became interested in the mineral lepidolite. The processed 150 kg and, as a result, separated double potassium, caesium and rubidium. The crustal abundance of rubidium.

Element Sodium Na, Alkali Metal. The chemical relations of sodium. Are very similar to those of potassium, so that for chemical purposes the one metal can in most cases replace the other. This holds good especially for those reactions in which the ions come into account. The reason of this is that natrion also represents a far more stable state than metallic sodium. Would die out by reason of the readily occurring lack of these. Cases of this have occurred, especially in former geological periods, and ha.

Element Strontium, Sr, Alkaline Earth Metal. Strontium forms only the divalent ion Sr. Whose solutions are colourless, and whose heat of formation is 501 kj. A very rare mineral, which before that could be found only in a couple of collections, named after the village of Strontian, Lochaber, Scotland. A mineral consisting of barium sulphate. He called the mineral strontianite.