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Period 6 element facts for kids

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A period 6 element is an element in the sixth period (row) of the periodic table. It contains 32 elements, beginning at Caesium and ending with Radon. The Lanthanides are part of this period.


This period contains the lanthanides, also known as the rare earths. Many lanthanides are known for their magnetic properties, such as neodymium. Many period 6 transition metals are very valuable, such as gold, however many period 6 other metals are incredibly toxic, such as thallium. Period 6 contains the last stable element, lead. All subsequent elements in the periodic table are radioactive. After bismuth, which has a half-life or more than 1019 years, polonium, astatine, and radon are some of the shortest-lived and rarest elements known; less than a gram of astatine is estimated to exist on earth at any given time.

Atomic characteristics

Chemical element Chemical series Electron configuration
55 Cs Caesium Alkali metal [Xe] 6s1
56 Ba Barium Alkaline earth metal [Xe] 6s2
57 La Lanthanum Lanthanide [Xe] 5d1 6s2
58 Ce Cerium Lanthanide [Xe] 4f1 5d1 6s2
59 Pr Praseodymium Lanthanide [Xe] 4f3 6s2
60 Nd Neodymium Lanthanide [Xe] 4f4 6s2
61 Pm Promethium Lanthanide [Xe] 4f5 6s2
62 Sm Samarium Lanthanide [Xe] 4f6 6s2
63 Eu Europium Lanthanide [Xe] 4f7 6s2
64 Gd Gadolinium Lanthanide [Xe] 4f7 5d1 6s2
65 Tb Terbium Lanthanide [Xe] 4f9 6s2
66 Dy Dysprosium Lanthanide [Xe] 4f10 6s2
67 Ho Holmium Lanthanide [Xe] 4f11 6s2
68 Er Erbium Lanthanide [Xe] 4f12 6s2
69 Tm Thulium Lanthanide [Xe] 4f13 6s2
70 Yb Ytterbium Lanthanide [Xe] 4f14 6s2
71 Lu Lutetium Lanthanide [Xe] 4f14 5d1 6s2
72 Hf Hafnium Transition metal [Xe] 4f14 5d2 6s2
73 Ta Tantalum Transition metal [Xe] 4f14 5d3 6s2
74 W Tungsten Transition metal [Xe] 4f14 5d4 6s2
75 Re Rhenium Transition metal [Xe] 4f14 5d5 6s2
76 Os Osmium Transition metal [Xe] 4f14 5d6 6s2
77 Ir Iridium Transition metal [Xe] 4f14 5d7 6s2
78 Pt Platinum Transition metal [Xe] 4f14 5d9 6s1
79 Au Gold Transition metal [Xe] 4f14 5d10 6s1
80 Hg Mercury Post-transition metal [Xe] 4f14 5d10 6s2
81 Tl Thallium Post-transition metal [Xe] 4f14 5d10 6s2 6p1
82 Pb Lead Post-transition metal [Xe] 4f14 5d10 6s2 6p2
83 Bi Bismuth Post-transition metal [Xe] 4f14 5d10 6s2 6p3
84 Po Polonium Post-transition metal [Xe] 4f14 5d10 6s2 6p4
85 At Astatine Metalloid [Xe] 4f14 5d10 6s2 6p5
86 Rn Radon Noble gas [Xe] 4f14 5d10 6s2 6p6
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Period 6 element Facts for Kids. Kiddle Encyclopedia.