Question

The period which contains the inner transition elements

Answer 1

Period 6 and 7 and grp 3 of periodic table contains the inner transition elements.
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Answer 2

An inner transition metal (ITM) is one of a group of chemical elements on the periodic table. They are normally shown in two rows below all the other elements. They include elements 57-71 (lanthanides) and 89-103 (actinides). The lanthanides are very similar, and the actinides are all radioactive.