Actinium (Ac)
Atomic Data for Actinium (Ac)
Atomic Number = 89
Atomic Weight = (227)
Reference
E95
Isotope
Mass
Abundance
Spin
Mag Moment
227
Ac
227.027750
Trace
3/2
-1.1
228
Ac
228.031015
Trace
3
Ac 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
6
d
7
s
2
2
D
3
/
2
Ionization energy 41700 cm
-1
(5.17 eV) Ref.
S74
Ac 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
7
s
2
1
S
0
Ionization energy 94800 cm
-1
(11.75 eV) Ref.
MHRS74
