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Pa - Protactinium (91/231.036)
Material List
Pa
(5)
1
material,
5
document(s) are retrieved.
Naturally occurring isotopes:
231 (minute quantities only)
Density:
15.37 (298.15K)
g/cm
3
Melting point:
1575
o
C
Boiling point:
o
C
Latent heat of fusion:
65
J/g
Specific heat:
0.12
J/g/K (at room temp.)
Coefficient of lineal thermal expansion:
1.12E-05
cm/cm/K (at room temp.)
Thermal conductivity:
W/cm/K (at room temp.)
Electrical resistivity:
hm-cm (at room temp.)
lonization potential (1st):
5.89
eV
Electronic work function Φ:
Oxidation potentials:
Pa → Pa
3+
+ 3e = 1.6
V
Chemical valence:
3 4 5
Electrochemical equivalents:
1.724
g/amp-hr
lonic radius:
0.78
angstrom
Valence electron potential:
92
-eV
Principal quantum number:
7
Principal electron shells:
K L M N O P Q
Electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f2 6s2 6p6 6d1 7s2
Valence electrons:
5f2 6d1 7s2
Crystal form:
Tetragonal
Half life:
3.248E4 years
Cross section σ:
200 ± 10
barns
Vapor pressure:
Pa (at melting point)
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