Periodic Table of the Elements Rubidium

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Periodic Table of the Elements: Rubidium

Periodic Table of the Elements: Rubidium

Atomic Number:	37
Atomic Symbol:	Rb
	Rubidium
Atomic Weight:	85.4678
Electron Configuration:	2 · 8 · 18 8 · 1

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rubidium

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

rubidium (symbol Rb) Silver-white metallic element of the alkali metals (group I of the periodic table). It ignites spontaneously in air and can be liquid at room temperature. It was discovered in 1861 by the German chemist Robert Bunsen and the German physicist Gustav Kirchhoff. The element has few commercial uses; small amounts are used in photoelectric cells, vacuum-tube filaments, and batteries. It chemically resembles sodium but is more reactive. Properties: at. no.37; r.a.m. 85.4678; r.d. 1.53; m.p. 38.89°C (102°F); b.p. 688°C (1270°F); most common isotope Rb⁸⁵ (72.15%).

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