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General properties
Name, simbolo, kaiphan actinium, Ac, 89
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Element category aktinido
sometimes considered a transition metal
Group, period, block 37, f
Standard atomic weight (227)
Electron configuration [Rn] 6d1 7s2
2, 8, 18, 32, 18, 9, 2
Electron shells of actinium (2, 8, 18, 32, 18, 9, 2)
Discovery André-Louis Debierne (1899)
First isolation André-Louis Debierne (1899)
Physical properties
Phase magahi
Density (near r.t.) 10 g·cm−3
Melting point (circa) 1323 K, 1050 °C, 1922 °F
Boiling point 3471 K, 3198 °C, 5788 °F
Heat of fusion 14 kJ·mol−1
Heat of vaporization 400 kJ·mol−1
Molar heat capacity 27.2 J·mol−1·K−1
Atomic properties
Oxidation states 3
(neutral oxide)
Electronegativity 1.1 (Pauling scale)
Ionization energies 1st: 499 kJ·mol−1
2nd: 1170 kJ·mol−1
Covalent radius 215 pm
Crystal structure face-centered cubic
Actinium has a face-centered cubic crystal structure
Magnetic ordering no data
Thermal conductivity 12 W·m−1·K−1
CAS registry number 7440-34-8
Most stable isotopes
Main article: Isotopes of actinium
iso NA half-life DM DE (MeV) DP
225Ac trace 10 d α 5.935 221Fr
226Ac syn 29.37 h β 1.117 226Th
ε 0.640 226Ra
α 5.536 222Fr
227Ac trace 21.772 y β 0.045 227Th
α 5.042 223Fr
· r

Ang actinyo (Iningles actinium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ac ug kaiphan nga atomik 89. Ang actinyo mao ang aktinido.

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