Period 6
6 elements in this period. All elements in the same period occupy the same number of electron shells.
32 elements
55
Cs
Cesium
132.905
56
Ba
Barium
137.33
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24
61
Pm
Promethium
144.913
62
Sm
Samarium
150.4
63
Eu
Europium
151.964
64
Gd
Gadolinium
157.25
65
Tb
Terbium
158.925
66
Dy
Dysprosium
162.5
67
Ho
Holmium
164.93
68
Er
Erbium
167.26
69
Tm
Thulium
168.934
70
Yb
Ytterbium
173.05
71
Lu
Lutetium
174.967
72
Hf
Hafnium
178.49
73
Ta
Tantalum
180.948
74
W
Tungsten
183.84
75
Re
Rhenium
186.207
76
Os
Osmium
190.2
77
Ir
Iridium
192.22
78
Pt
Platinum
195.08
79
Au
Gold
196.967
80
Hg
Mercury
200.59
81
Tl
Thallium
204.383
82
Pb
Lead
207
83
Bi
Bismuth
208.98
84
Po
Polonium
208.982
85
At
Astatine
209.987
86
Rn
Radon
222.018
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