View source for Rubidium

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{{Elem_Infobox
|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>
|no1=
|no2=
|no3=
|no4=
|properties=Soft, silvery-white metal in its solid state.
|compounds= 
|uses= 
|hazard=
}}

'''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==

Rubidium has two naturally occurring isotopes:  <sup>85</sup>Rb with mass (atomic weight) 84.911&thinsp;7893 and abundance 72.17%, and <sup>87</sup>Rb with mass 86.909&thinsp;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>&minus;7</sup> K shows [[Bose-Einstein condensation]].

==Reference==
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