Protactinium (Pa)
Atomic Data for Protactinium (Pa)
Atomic Number = 91
Atomic Weight = 231.03588
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
231
Pa
231.035880
Trace
3/2
+2.01
234
Pa
234.043303
Trace
4
Pa I Ground State 1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
3
d
1
0
4
s
2
4
p
6
4
d
1
0
4
f
1
4
5
s
2
5
p
6
5
d
1
0
6
s
2
6
p
6
5
f
2
6
d
7
s
2
4
K
1
1
/
2
Ionization energy 47500 cm
-1
(5.89 eV) Ref.
S74
Pa II Ground State 1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
3
d
1
0
4
s
2
4
p
6
4
d
1
0
4
f
1
4
5
s
2
5
p
6
5
d
1
0
6
s
2
6
p
6
5
f
2
7
s
2
3
H
4
