hydrogen, coal, iodine, oxygen, sodium, and iron
Metals present in the periodic table are conductors.
A Periodic table The Periodic Table of the Elements.
atomic number
It is called the Periodic Table of Elements.
By grouping the elements on the Periodic Table.
I can find only two types The Mendeleves Periodic table based on Atomic weight of elements and The Modern Periodic table based on Atomic number of elements.
See the link below fot the IUPAC model of the periodic table of elements.
Naturally occurring and man made elements
Elements of the Periodic Table
Metals and non-metals.
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
The atomic number that sodium has in periodic table is 11 and valency is 1. The periodic table is a kind of table that was invented for the better study of elements and other types of compound. It makes the systematic study of elements.