Promethium: Difference between revisions
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imported>David Yamakuchi m (New page: {{subpages}}{{Basic elemental info}}<references/>) |
imported>Milton Beychok m (Replaced the Infobox and re-wrote the lede.) |
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'''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 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 18:34, 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.