Lanthanum (La)
Atomic Data for Lanthanum (La)
Atomic Number = 57
Atomic Weight = 138.9055
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
138
La
137.907105
0.09%
5
+3.707
139
La
138.906346
99.10%
7/2
+2.778
La 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
5
s
2
5
p
6
)5
d
6
s
2
2
D
3
/
2
Ionization energy 44981 cm
-1
(5.5769 eV) Ref.
MZH78
La 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
5
s
2
5
p
6
) 5
d
2
3
F
2
Ionization energy 89200 cm
-1
(11.059 eV) Ref.
SR65
