6. periode
Cæsium
55
Barium
56
Lanthanum
57
Cerium
58
Praseodymium
59
Neodymium
60
Promethium
61
Samarium
62
Europium
63
Gadolinium
64
Terbium
65
Dysprosium
66
Holmium
67
Erbium
68
Thulium
69
Ytterbium
70
Lutetium
71
Hafnium
72
Tantalum
73
Wolfram
74
Rhenium
75
Osmium
76
Iridium
77
Platin
78
Guld
79
Kviksølv
80
Thallium
81
Bly
82
Bismuth
83
Polonium
84
Astat
85
Radon
86
Periodisk System
Sprog
Hent