Period 6 of the Periodic Table

Period 6 of the periodic table has 32 elements, from Cesium (Cs) to Radon (Rn). The period number usually equals the number of electron shells of the atom, and in this period the 6s, 4f, 5d and 6p subshells are filled. Moving left to right across a period, the atomic number increases and the atomic radius usually decreases.

Element list

Atomic no.	Symbol	Name	Atomic mass	Phase	Short configuration
55	Cs	Cesium	132.91	Solid	[Xe] 6s¹
56	Ba	Barium	137.33	Solid	[Xe] 6s²
57	La	Lanthanum	138.91	Solid	[Xe] 5d¹ 6s²
58	Ce	Cerium	140.12	Solid	[Xe] 4f¹ 5d¹ 6s²
59	Pr	Praseodymium	140.91	Solid	[Xe] 4f³ 6s²
60	Nd	Neodymium	144.24	Solid	[Xe] 4f⁴ 6s²
61	Pm	Promethium	145	Solid	[Xe] 4f⁵ 6s²
62	Sm	Samarium	150.36	Solid	[Xe] 4f⁶ 6s²
63	Eu	Europium	151.96	Solid	[Xe] 4f⁷ 6s²
64	Gd	Gadolinium	157.25	Solid	[Xe] 4f⁷ 5d¹ 6s²
65	Tb	Terbium	158.93	Solid	[Xe] 4f⁹ 6s²
66	Dy	Dysprosium	162.5	Solid	[Xe] 4f¹⁰ 6s²
67	Ho	Holmium	164.93	Solid	[Xe] 4f¹¹ 6s²
68	Er	Erbium	167.26	Solid	[Xe] 4f¹² 6s²
69	Tm	Thulium	168.93	Solid	[Xe] 4f¹³ 6s²
70	Yb	Ytterbium	173.05	Solid	[Xe] 4f¹⁴ 6s²
71	Lu	Lutetium	174.97	Solid	[Xe] 4f¹⁴ 5d¹ 6s²
72	Hf	Hafnium	178.49	Solid	[Xe] 4f¹⁴ 5d² 6s²
73	Ta	Tantalum	180.95	Solid	[Xe] 4f¹⁴ 5d³ 6s²
74	W	Tungsten	183.84	Solid	[Xe] 4f¹⁴ 5d⁴ 6s²
75	Re	Rhenium	186.21	Solid	[Xe] 4f¹⁴ 5d⁵ 6s²
76	Os	Osmium	190.23	Solid	[Xe] 4f¹⁴ 5d⁶ 6s²
77	Ir	Iridium	192.22	Solid	[Xe] 4f¹⁴ 5d⁷ 6s²
78	Pt	Platinum	195.08	Solid	[Xe] 4f¹⁴ 5d⁹ 6s¹
79	Au	Gold	196.97	Solid	[Xe] 4f¹⁴ 5d¹⁰ 6s¹
80	Hg	Mercury	200.59	Liquid	[Xe] 4f¹⁴ 5d¹⁰ 6s²
81	Tl	Thallium	204.38	Solid	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
82	Pb	Lead	207.2	Solid	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p²
83	Bi	Bismuth	208.98	Solid	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³
84	Po	Polonium	209	Solid	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴
85	At	Astatine	210	Solid	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
86	Rn	Radon	222	Gas	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

Frequently asked questions

How many elements are in period 6 of the periodic table?

Period 6 of the periodic table has 32 elements.

Which elements are in period 6?

The elements of period 6 run from Cesium to Radon: Cesium (Cs), Barium (Ba), Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu), Hafnium (Hf), Tantalum (Ta), Tungsten (W), Rhenium (Re), Osmium (Os), Iridium (Ir), Platinum (Pt), Gold (Au), Mercury (Hg), Thallium (Tl), Lead (Pb), Bismuth (Bi), Polonium (Po), Astatine (At) and Radon (Rn).