2
He
Hel
4.0026
10
Ne
Neon
20.18
18
Ar
Argon
39.948
36
Kr
Krypton
83.798
54
Xe
Ksenon
131.29
57
La
Lantan
138.91
58
Ce
Cer
140.12
59
Pr
Prazeodym
140.91
60
Nd
Neodym
144.24
61
Pm
Promet
144.24
62
Sm
Samar
150.36
63
Eu
Europ
151.96
64
Gd
Gadolin
157.25
65
Tb
Terb
158.93
66
Dy
Dysproz
162.5
67
Ho
Holm
164.93
68
Er
Erb
167.26
69
Tm
Tul
168.93