Einsteinium (Es)
Atomic Data for Einsteinium (Es)
Atomic Number = 99
Atomic Weight = (254)
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
252
Es
252.082944
0
5
253
Es
253.084818
0
7/2
4.10
254
Es
254.088019
0
7
255
Es
255.090270
0
7/2
Es 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
1
1
7
s
2
4
I°
1
5
/
2
Ionization energy 51800 cm
-1
(6.42 eV) Ref.
S74
Es 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
1
1
(
4
I
1
5
/
2
)7
s
(
1
5
/
2
,
1
/
2
)°
8
Ionization energy [97000] cm
-1
(12.0 eV) Ref.
CNWM70
