why are lantanoids and anthanoids plased saparately from periodic table
Answers
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). The reason why inner-transition metals are located at the bottom of the periodic table, separated from the rest is because they all fill the f-block. The Lanthanides and Actinides both fill out the f-block concluding to differ in properties and chemical structures compared to the other elements (s, p and d block elements). The f-block elements consist of 28 elements which is wide and if were too put in their atomic number position alongside the transition metals the periodic table would be too wide and wouldn’t be able to fit in standard a4 paper or a page in an educational book (image above), hence it was placed below the other groups to keep the periodic table in good size to fit multiple needs
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).