>Burzuchius at 20:38, 18 February 2025

2025-02-18T20:38:54Z

New page

{{Infobox element
|engvar={{{engvar|}}}
|name =actinium
|number =89
|Z =89
|symbol =Ac
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[radium]]
|right=[[thorium]]
|above=[[lanthanum|La]]
|below=—
|appearance=silvery-white, glowing with an eerie blue light;<ref>{{cite web |url=http://pubs.acs.org/cen/80th/actinium.html |title=C&EN: It's Elemental: The Periodic Table - Actinium |author=Wall, Greg |date=8 September 2003 |work=C&EN: It's Elemental: The Periodic Table |publisher=Chemical and Engineering News |access-date=2 June 2011}}</ref> sometimes with a golden cast<ref name="Kirby">{{cite book |last1=Kirby |first1=Harold W. |last2=Morss |first2=Lester R. |title=The Chemistry of the Actinide and Transactinide Elements |pages=18 |year=2006 |doi=10.1007/1-4020-3598-5_2 |chapter=Actinium |isbn=978-1-4020-3555-5}}</ref>
|image name=Actinium sample (31481701837).png
|electrons per shell=2, 8, 18, 32, 18, 9, 2
|phase=
|phase comment=
|density gplstp=
|density gpcm3nrt=10
|melting point K=1500
|melting point C=1227
|melting point F=2240
|melting point comment=''(estimated)''<ref name=Kirby/>
|boiling point K=3500±300
|boiling point C=3200±300
|boiling point F=5800±500
|boiling point comment=''(extrapolated)''<ref name=Kirby/>
|triple point K=
|triple point kPa=
|critical point K=
|critical point MPa=
|heat fusion=14
|heat vaporization=400
|heat capacity=27.2
|crystal structure=face-centered cubic
|crystal structure Pearson symbol=cF4
|lattice constant=''a'' = 531.5 pm (at 20 °C)<ref name="Arblaster 2018">{{cite book |last=Arblaster |first= John W. |title=Selected Values of the Crystallographic Properties of Elements |publisher=ASM International |publication-place=Materials Park, Ohio |date=2018 |isbn=978-1-62708-155-9}}</ref>
|electronegativity=1.1
|number of ionization energies=4
|ionization energy 1=499
|ionization energy 2=1170
|ionization energy 3=1900
|atomic radius=
|covalent radius=215
|Van der Waals radius=
|electrical resistivity=
|electrical resistivity at 0=
|electrical resistivity at 20=
|thermal conductivity=12
|thermal conductivity 2=
|thermal diffusivity=
|thermal expansion=
|thermal expansion at 25=
|speed of sound=
|speed of sound rod at 20=
|speed of sound rod at r.t.=
|magnetic susceptibility=
|magnetic susceptibility ref=
|Young's modulus=
|Shear modulus=
|Bulk modulus=
|Poisson ratio=
|Mohs hardness=
|Vickers hardness=
|Brinell hardness=
|CAS number=7440-34-8
|discovered by=[[Friedrich Oskar Giesel]]
|discovery date=1902
|first isolation by=Joseph G. Stites, Murrell L. Salutsky, Bob D. Stone
|first isolation date=1955
|named by=[[André-Louis Debierne]]
|named date=1899
|QID =Q1121
}}<noinclude>
{{Infobox element/element navigation|symbol=Ac}}
{{notelist}}
{{template reference list}}
{{documentation|1=Template:Infobox element/doc}}
</noinclude>

Template:Infobox actinium - Revision history

>Burzuchius at 20:38, 18 February 2025