A rare metallic element. 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, 85.2.
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Rubidium
Encyclopedia Britannica
RUBIDIUM. See Potassium Metals.
9th ed. Encyclopædia Britannica, vol. 21, p. 46
[4 words — estimated reading time: 1 minute]
[4 words — estimated reading time: 1 minute]
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