The periodic table is an array of various elements. Iodine is an element. Hence it finds it place on the periodic table.
A Periodic table The Periodic Table of the Elements.
An elements period is its row in the periodic table.
atomic number
It is called the Periodic Table of Elements.
By grouping the elements on the Periodic Table.
A higher place in the periodic table of the elements.
See the link below fot the IUPAC model of the periodic table of elements.
Elements of the Periodic Table
elements chart
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
The Periodic table contains only elements, however, HO4 is a compound and hence has no place on the period table.