Template:Infobox actinium

Actinium, ₈₉Ac
Actinium
Pronunciation	/ækˈtɪniəm/ (ak-TIN-nee-əm)
Appearance	sillery-white, glowin wi an eerie blue licht; sometimes with a golden cast
Mass number	[227]
Actinium in the periodic cairt
	radium ← actinium → thorium
Atomic nummer (Z)	89
Group	group 3
Period	period 7
Block	f-block
Element category	Actinide
Electron confeeguration	[Rn] 6d1 7s2
Electrons per shell	2, 8, 18, 32, 18, 9, 2
Pheesical properties
Phase at STP	solit
Meltin pynt	1500 K (1227 °C, 2240 °F) (estimatit)
Bylin pynt	3500±300 K (3200±300 °C, 5800±500 °F) (extrapolatit)
Density (near r.t.)	10 g/cm3
Heat o fusion	14 kJ/mol
Heat o vapourisation	400 kJ/mol
Molar heat capacity	27.2 J/(mol·K)
Atomic properties
Oxidation states	+2, +3 strangly basic
Electronegativity	Pauling scale: 1.1
Ionisation energies	1st: 499 kJ/mol ; 2nd: 1170 kJ/mol ; ;
Covalent radius	215 pm
	Colour lines in a spectral rangeSpectral lines o actinium
Ither properties
Creestal structur	face-centred cubic Face-centred cubic creestal structur for actinium
Thermal conductivity	12 W/(m·K)
CAS Nummer	7440-34-8
History
Diskivery an first isolation	Friedrich Oskar Giesel (1902)
Main isotopes o actinium
ε	226Ra
α	222Fr
α	223Fr
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style="text-align:left"\| data m.p. cat v
	in	calc from C	diff	report	ref
C	1227	—	—
K	1500	1500	0
F	2240	2241	-1	delta
WD
input	C: 1227, K: 1500, F: 2240
comment	(estimatit)^[2]

style="text-align:left"\| data b.p. cat v
	in	calc from C	diff	report	ref
C	3200	—	—
K	3500	3470	30	delta
F	5800	5790	10	delta
WD
input	C: 3200±300, K: 3500±300, F: 5800±500
comment	(extrapolatit)^[2]

References

↑ Wall, Greg (8 September 2003). "C&EN: It's Elemental: The Periodic Table - Actinium". C&EN: It's Elemental: The Periodic Table. Chemical and Engineering News. Retrieved 2 Juin 2011.
1 2 3 4 5 Kirby, Harold W.; Morss, Lester R. (2006). "Actinium". The Chemistry of the Actinide and Transactinide Elements. p. 18. doi:10.1007/1-4020-3598-5_2. ISBN 978-1-4020-3555-5.