Selenium (Se)
Atomic Data for Selenium (Se)
Atomic Number = 34
Atomic Weight = 78.96
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
74
Se
73.922475
0.9%
0
76
Se
75.919212
9.2%
0
77
Se
76.919212
7.6%
1/2
+0.535506
78
Se
77.9173
23.7%
0
80
Se
79.916520
49.8%
0
82
Se
81.916698
8.8%
0
Se 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
4
3
P
2
Ionization energy 78658.35 cm
-1
(9.75239 eV) Ref.
MV74
,
LP77
Se 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
3
4
S°
3
/
2
Ionization energy 170900 cm
-1
(21.19 eV) Ref.
CR58
