Rubidium: Difference between revisions
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|elName=Rubidium | |||
|eltrnCfg=1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>3d<sup>10</sup>4s<sup>2</sup> | |||
4p<sup>6</sup>5s<sup>1</sup> | |||
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|properties=Soft, silvery-white metal in its solid state. | |||
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'''Rubidium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Rb. Its [[atomic number]] (the number of [[proton]]s) is 37. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 85.4678 g•mol<sup> −1</sup>. | |||
Rubidium is considered to be a member of the "Alkali metal" class of element. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 688 °[[Celsius (unit)|C]] and a melting point of 39.3 °C. In its elemental form, Rubidium is a solid at typical room temperatures of 15 − 25 °C. | |||
==Isotopes== | ==Isotopes== | ||
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Revision as of 11:47, 21 April 2011
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Rubidium is a chemical element, having the chemical symbol Rb. Its atomic number (the number of protons) is 37. It has a standard atomic weight of 85.4678 g•mol −1.
Rubidium is considered to be a member of the "Alkali metal" class of element. At a pressure of 101.325 kPa, it has a boiling point of 688 °C and a melting point of 39.3 °C. In its elemental form, Rubidium is a solid at typical room temperatures of 15 − 25 °C.
Isotopes
Rubidium has two naturally occurring isotopes: 85Rb with mass (atomic weight) 84.911 7893 and abundance 72.17%, and 87Rb with mass 86.909 1835 and abundance 27.83%.[1] The very dilute gas of ground state 87Rb atoms at a temperature of 1.7•10−7 K shows Bose-Einstein condensation.