Actinium: Difference between revisions
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imported>Milton Beychok m (Replaced the info box and edited the lede somewhat. Also reformatted the references properly.) |
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'''Actinium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ac. Its [[atomic number]] (the number of [[proton]]s) is 89. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 227 g•mol<sup> −1</sup> and it is a [[solid]] in its elemental form. | |||
Actinium is considered a member of the "Transition metal" class of elements. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 3,198 °[[Celsius (unit)|C]] and a [[melting point]] of 1,051 °C. | |||
==History== | ==History== | ||
Actinium has been discovered in 1899 by [[André-Louis Debierne]], and independently by F. Giesel in | |||
Actinium has been discovered in 1899 by [[André-Louis Debierne]], and independently by F. Giesel in 1902. This element was named from the [[Greek language|Greek]] word ''aktis, aktinos'' (ακτίς, ακτίνος), meaning beam or ray.<ref>{{cite book|author=William M.Haynes|title=Handbook of Chemistry and Physics|edition=91st Edition|publisher=CRC Press|year=2010|id=ISBN 1-4398-2077-5}}</ref> | |||
==References== | ==References== | ||
{{reflist}} | |||
Revision as of 23:04, 2 May 2011
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Actinium is a chemical element, having the chemical symbol Ac. Its atomic number (the number of protons) is 89. It has a standard atomic weight of 227 g•mol −1 and it is a solid in its elemental form.
Actinium is considered a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 3,198 °C and a melting point of 1,051 °C.
History
Actinium has been discovered in 1899 by André-Louis Debierne, and independently by F. Giesel in 1902. This element was named from the Greek word aktis, aktinos (ακτίς, ακτίνος), meaning beam or ray.[1]
References
- ↑ William M.Haynes (2010). Handbook of Chemistry and Physics, 91st Edition. CRC Press. ISBN 1-4398-2077-5.