6. period
Cesium
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
Tungsten
74
Rhenium
75
Osmium
76
Iridium
77
Platinum
78
Gold
79
Mercury
80
Thallium
81
Lead
82
Bismuth
83
Polonium
84
Astatine
85
Radon
86
Periodic Table
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