Rb



Symbol, Chemistry.
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Chemical symbol
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rubidium

Rb
The symbol for the element rubidium.
Rb
The symbol for rubidium.
rubidium
(r-bĭd’ē-əm)
Symbol Rb
A soft, silvery-white metallic element of the alkali group. It ignites spontaneously in air and reacts violently with water. Rubidium is used in photoelectric cells, in making vacuum tubes, and in radiometric dating. Atomic number 37; atomic weight 85.47; melting point 38.89°C; boiling point 688°C; specific gravity (solid) 1.532; valence 1, 2, 3, 4. See Periodic Table.
rubidium
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Botswana (international vehicle ID)
2.
reciprocal beneficiary
3.
running back

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