Period 6
Period 6
The longest: 32 elements, including the 14 lanthanides squeezed into the f-block between La and Hf.
Element count
32
First element
Z = 55
Last element
Z = 86
Period 6 is the first to bring in the f-block: the 14 lanthanides (Ce to Lu) sit inside the period and are detached visually at the bottom of the table to preserve readability. It contains precious metals (Pt, Au), mercury (liquid at room temperature) and the common stable heavy elements (Pb, Bi).
Filling subshells
6s4f5d6p
32 elements
55Cs
Césium
Alkali metals · Period 6
56Ba
Baryum
Alkaline earth metals · Period 6
57La
Lanthane
Lanthanides · Period 6
58Ce
Cérium
Lanthanides · Period 6
59Pr
Praséodyme
Lanthanides · Period 6
60Nd
Néodyme
Lanthanides · Period 6
61Pm
Prométhium
Lanthanides · Period 6
62Sm
Samarium
Lanthanides · Period 6
63Eu
Europium
Lanthanides · Period 6
64Gd
Gadolinium
Lanthanides · Period 6
65Tb
Terbium
Lanthanides · Period 6
66Dy
Dysprosium
Lanthanides · Period 6
67Ho
Holmium
Lanthanides · Period 6
68Er
Erbium
Lanthanides · Period 6
69Tm
Thulium
Lanthanides · Period 6
70Yb
Ytterbium
Lanthanides · Period 6
71Lu
Lutécium
Lanthanides · Period 6
72Hf
Hafnium
Transition metals · Period 6
73Ta
Tantale
Transition metals · Period 6
74W
Tungstène
Transition metals · Period 6
75Re
Rhénium
Transition metals · Period 6
76Os
Osmium
Transition metals · Period 6
77Ir
Iridium
Transition metals · Period 6
78Pt
Platine
Transition metals · Period 6
79Au
Or
Transition metals · Period 6
80Hg
Mercure
Transition metals · Period 6
81Tl
Thallium
Post-transition metals · Period 6
82Pb
Plomb
Post-transition metals · Period 6
83Bi
Bismuth
Post-transition metals · Period 6
84Po
Polonium
Post-transition metals · Period 6
85At
Astate
Halogens · Period 6
86Rn
Radon
Noble gases · Period 6