Europium (Eu)
Atomic Data for Europium (Eu)
Atomic Number = 63
Atomic Weight = 151.965
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
151
Eu
150.919847
47.8%
5/2
+3.464
153
Eu
152.921225
52.2%
5/2
+1.530
Eu 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
)4
f
7
6
s
2
8
S°
7
/
2
Ionization energy 45734.74 cm
-1
(5.67038 eV) Ref.
NRCA00
Eu 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
)4
f
7
6
s
9
S°
4
Ionization energy 90700 cm
-1
(11.25 eV) Ref.
SR65
