What is Period 6 element?
A '''period 6 element''' is an [[Chemical element|element]] in the sixth [[period (periodic table)|period]] (row) of the [[periodic table]]. It contains 32 elements, beginning at [[Caesium]] and ending with [[Radon]]. The [[Lanthanide]]s (also called the rare earth elements) are part of this period. The lanthanides stretch from lanthanum (57) to lutetium (71). Period 6 elements have [[electrons]] in the first six [[electron shell]]s. All period 6 elements have one or more electrons in the sixth electron shell ([[valence electrons]]). When atomic number increases by one, another electron is added. Two electrons join the 6s [[atomic orbital|orbital]], 14 electrons join the 4f orbital, ten electrons join the 5d orbital, and six electrons join the 6p orbitals. {{Periodic tables footer}} [[Category:Periodic table]] {{chem-stub}}