Those are other elements that didnt have enough space to go with the other elements.
Group 7 of the periodic table.
All chemical elements are placed in the periodic table.
At the bottom of the Periodic Table
Actinoids are placed in a separate row under the periodic table.
Radon is an inert gas. The so-called noble gases are in column 18 of the Periodic Table, and radon is at the bottom.
At the very bottom -- those 2 separate rows are inner trans.
The f-block elements are placed at the bottom of the periodic table because if they were placed where they belong the periodic table would be too big to fit on a normal sheet of paper.
metals
alkali
Lanthanum is located on the right to the bottom side on the periodic table.
the energy level increases as we move from top to bottom in the periodic table
Fluorine belongs to the halogen family in the periodic table.