Rubidium: Difference between revisions
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imported>Paul Wormer m (Isotopes + BE condensation) |
imported>Milton Beychok (Added Isotopes section header) |
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==Isotopes== | |||
Rubidium has two naturally occurring isotopes: <sup>85</sup>Rb with mass (atomic weight) 84.911 7893 and abundance 72.17%, and <sup>87</sup>Rb with mass 86.909 1835 and abundance 27.83%.<ref>[http://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=Rb&ascii=html&isotype=some NIST data]</ref> The very dilute gas of ground state <sup>87</sup>Rb atoms at a temperature of 1.7•10<sup>−7</sup> K shows [[Bose-Einstein condensation]]. | Rubidium has two naturally occurring isotopes: <sup>85</sup>Rb with mass (atomic weight) 84.911 7893 and abundance 72.17%, and <sup>87</sup>Rb with mass 86.909 1835 and abundance 27.83%.<ref>[http://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=Rb&ascii=html&isotype=some NIST data]</ref> The very dilute gas of ground state <sup>87</sup>Rb atoms at a temperature of 1.7•10<sup>−7</sup> K shows [[Bose-Einstein condensation]]. | ||
==Reference== | ==Reference== | ||
<references /> | <references /> | ||
Revision as of 11:19, 21 April 2011
Rubidium is a chemical element, having the chemical symbol Rb.
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Its atomic number (the number of protons) is 37. It has a Standard Atomic Weight of 85.4678(3), and is typically found as a solid in its elemental form.
Rubidium is considered to be a member of the "Alkali metal" class of elements, has a boiling point of 688 °C , and a melting point of 39.3 °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.