Promethium: Difference between revisions
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imported>David Yamakuchi mNo edit summary |
imported>Milton Beychok m (Replaced the Infobox and re-wrote the lede.) |
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| | |elName=Promethium | ||
| | |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> 4d<sup>10</sup>5s<sup>2</sup>5p<sup>6</sup>4f<sup>5</sup>6s<sup>2</sup> | ||
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Its [[atomic number]] (the number of [[ | '''Promethium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Pm. Its [[atomic number]] (the number of [[proton]]s) is 61. The [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of <sup>145</sup>Pm, its isotope with the longest [[half-life]] (17.7 years) is 144.9127 g•mol<sup> −1</sup> and it is a [[solid]] in its elemental form. | ||
Promethium | |||
Promethium is considered a member of the "Lanthanide" class of elements. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of ~3000 °[[Celsius (unit)|C]] and a [[melting point]] of 1,042 °C. | |||
Latest revision as of 19:34, 28 April 2011
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Promethium is a chemical element, having the chemical symbol Pm. Its atomic number (the number of protons) is 61. The standard atomic weight of 145Pm, its isotope with the longest half-life (17.7 years) is 144.9127 g•mol −1 and it is a solid in its elemental form.
Promethium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of ~3000 °C and a melting point of 1,042 °C.