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{{Infobox element
|engvar={{{engvar|}}}
|name=actinium
|number=89
|symbol=Ac
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[radium]]
|right=[[thorium]]
|above=[[lanthanum|La]]
|below=(Uqt)
|period=7
|group=n/a
|block=f
|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
|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
|isotopes=
{{infobox element/isotopes decay | mn=225 | sym=Ac |link=actinium-225
|na=[[trace radioisotope|trace]] | hl=10 d
|dm=[[alpha decay|α]] | de=5.935 | link1=francium-221 | pn=221 | ps=Fr}}
{{infobox element/isotopes decay3| mn=226 | sym=Ac
|na=[[synthetic radioisotope|syn]] | hl=29.37 h
|dm1=[[beta emission|β<sup>−</sup>]] | de1=1.117 | link1=thorium-226 | pn1=226 | ps1=Th
|dm2=[[electron capture|ε]] | de2=0.640 | link2=radium-226 | pn2=226 | ps2=Ra
|dm3=α | de3=5.536 | link3=francium-222 | pn3=222 | ps3=Fr}}
{{infobox element/isotopes decay2 | mn=227 | sym=Ac
|na=trace | hl=21.772 y
|dm1=β<sup>−</sup> | de1=0.045 | link1=thorium-227 | pn1=227 | ps1=Th
|dm2=α | de2=5.042 | link2=francium-223 | pn2=223 | ps2=Fr}}
|isotopes comment=
|discovery and first isolation by=[[Friedrich Oskar Giesel]]
|discovery date=1902
|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>

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Admin: 1 revision imported: setup

setup>Double sharp at 14:14, 23 January 2021