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:
Colors in the periodic table show element categories
Standard · Inline f-block · Vertical · Full names · Names and atomic weights · Text for last · Large table · Metals and nonmetals · Blocks · Valences · Extension beyond the 7th period · Electron configurations · Atomic weights · Electronegativities · Alternatives · Crystal structure