A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the elements, including the lanthanides.

These are:

Chemical elements in the sixth period

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
# Name	55 Cs	56 Ba	57-71	72 Hf	73 Ta	74 W	75 Re	76 Os	77 Ir	78 Pt	79 Au	80 Hg	81 Tl	82 Pb	83 Bi	84 Po	85 At	86 Rn
e--conf.
Lanthanides			57 La	58 Ce	59 Pr	60 Nd	61 Pm	62 Sm	63 Eu	64 Gd	65 Tb	66 Dy	67 Ho	68 Er	69 Tm	70 Yb	71 Lu
e--conf.

Colors in the periodic table show element categories

Metals					Metalloids	Nonmetals
Alkali metals	Alkaline earth metals	Inner transition elements	Transition elements	Other metals		Other nonmetals	Halogens	Noble gases
		Lanthanoids
		Actinoids		(Unknown type)

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