Erbium (Er)
Atomic Data for Erbium (Er)
Atomic Number = 68
Atomic Weight = 167.26
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
162
Er
161.928775
0.14%
0
164
Er
163.929198
1.61%
0
166
Er
165.930290
33.6%
0
167
Er
166.932046
22.95%
7/2
-0.5665
168
Er
167.932368
26.8%
0
170
Er
169.935461
14.9%
0
Er 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
1
2
6
s
2
3
H
6
Ionization energy 49262 cm
-1
(6.1077 eV) Ref.
WSPC78
Er 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
1
2
(
3
H
6
)6
s
(6,
1
/
2
)
1
3
/
2
Ionization energy 96200 cm
-1
(11.93 eV) Ref.
SR65
