1
Q
Promethium
A
Pm
2
Q
Pm
A
Promethium
3
Q
Samarium
A
Sm
4
Q
Sm
A
Samarium
5
Q
Europium
A
Eu
6
Q
Eu
A
Europium
7
Q
Gadolinium
A
Gd
8
Q
Gd
A
Gadolinium
9
Q
Terbium
A
Tb
10
Q
Tb
A
Terbium
11
Q
Dysprosium
A
Dy
12
Q
Dy
A
Dysprosium
13
Q
Holmium
A
Ho
14
Q
Ho
A
Holmium
15
Q
Erbium
A
Er
16
Q
Er
A
Erbium
17
Q
Thulium
A
Tm
18
Q
Tm
A
Thulium
19
Q
Ytterbium
A
Yb
20
Q
Yb
A
Ytterbium
