Rubidium n. (Chem.) A rare metallic element of the alkali metal series, atomic number 37. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.48.
... Micro-Elements: Lithium, rubidium, caesium, silver, beryllium, strontium, cadmium, germanium, tin, lead, arsenic, ... — Northern Nut Growers Association Report of the Proceedings at the Thirty-Seventh Annual Report • Various
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