Actinium - angew. Mineralogie

89 Ac Actinium

`Atomic number`		`89`
`Symbol`		`Ac`
`Atomic weight`		`227.0278`
`Density [g/cm³]`		`10.07`
`Melting point [°C]`		`1050`
`Boiling point [°C]`		`3200`
`1st Ionization energy [eV]`		`6.9`
`Electronic configuration`		`[Rn] 6d 7s²`
`Oxidation number (most stable)`		`3`
`Atomic radius [pm]`		`187,8`
`Ionic radius [pm]`		`118 (3+)`
`Abundance in crustal rocks [ppm]`		`small traces`
`Origin of the name`		`(greek) actinoeis = ray emitting`
`Discovery`		`1899 by André Debierne`
`Uses`		`for the generation of neutrons.`

© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst

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