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Ac - Actinium (89/227)
Material List
Currently compound materials are not available.
Naturally occurring isotopes:
227 (minute quantities only)
Density:
10.07 (298.15K)
g/cm
3
Melting point:
1100 ± 50
o
C
Boiling point:
3200 ± 300 (est)
o
C
Latent heat of fusion:
62
J/g
Specific heat:
.012
J/g/K (at room temp.)
Coefficient of lineal thermal expansion:
cm/cm/K (at room temp.)
Thermal conductivity:
.012
W/cm/K (at room temp.)
Electrical resistivity:
hm-cm (at room temp.)
lonization potential (1st):
5.17
eV
Electronic work function Φ:
Oxidation potentials:
Ac → Ac
3+
+ 3e = 2.2
V
Chemical valence:
3
Electrochemical equivalents:
2.82347
g/amp-hr
lonic radius:
1.19 (Ac
3+
angstrom
Valence electron potential:
38.60 (Ac
3+
)
-eV
Principal quantum number:
7
Principal electron shells:
K L M N O P Q
Electronic configuration:
1s2 2s2 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d1 7s2
Valence electrons:
6d1 7s2
Crystal form:
FCC
Half life:
21.77 years
Cross section σ:
810 ± 20
barns
Vapor pressure:
Pa (at melting point)
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