మూస:Infobox actinium

ఆక్టీనియం, ₀₀Ac
ఆక్టీనియం
Pronunciation	/ækˈtɪniəm/ (ak-TIN-ee-əm)
Appearance	silvery-white, glowing with an eerie blue light
ఆక్టీనియం in the periodic table
Group	f-block groups (no number)
Period	period 7
Block
Electrons per shell	2, 8, 18, 32, 18, 9, 2
Physical properties
Phase at STP	solid
Melting point	(circa) 1323 K (1050 °C, 1922 °F)
Boiling point	3471 K (3198 °C, 5788 °F)
Density (near r.t.)	10 g/cm3
Heat of fusion	14 kJ/mol
Heat of vaporization	400 kJ/mol
Molar heat capacity	27.2 J/(mol·K)
Atomic properties
Oxidation states	+3 (a strongly basic oxide)
Electronegativity	Pauling scale: 1.1
Covalent radius	215 pm
Other properties
Natural occurrence	from decay
Crystal structure	face-centered cubic (fcc)
Thermal conductivity	12 W/(m⋅K)
Magnetic ordering	no data
CAS Number	7440-34-8
History
Discovery	Friedrich Oskar Giesel (1902)
First isolation	Friedrich Oskar Giesel (1902)
Isotopes of ఆక్టీనియం v; e;
	Template:infobox ఆక్టీనియం isotopes does not exist
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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 June 2011.