Question

Why f block elements are placed at the bottom of periodic table?

Answer 1

Here is your answer....The reason why Lanthanides and Actinides are located at the bottom of the periodical table is because of their properties and in the block in which electrons fill up. The lanthanides include elements 58 to 71 (fill out the 4f subshell) and the actinides include elements 89 to 103 (fill out the 5f subshell).

Answer 2

because they have different properties than others metal they are radioactive in nature and they have a new shell f.