Originally according to western Oregon universities' site: "brief history of the Periodic Table" the creators wanted a way to track the elements. Originally it was just the elements found in nature. The man made elements came later and were added to the already widely used table. I don't have WOU'S site for reference but you can find it easily from Google. Or just type in" brief history of periodic table" into you favorite search engine.
including "unknown elements" there are 59 elements in half of the periodic table, not including them there is 55.5 Added: 92 natural elements/2 = 46 natural elements make up 1/2 periodic table.
Artificial elements.
A Periodic table The Periodic Table of the Elements.
Because they are natural elements of earth.
Yes, all the elements (natural or artificial) are contained in the periodic (Mendeleev) table of the elements.
including "unknown elements" there are 59 elements in half of the periodic table, not including them there is 55.5 Added: 92 natural elements/2 = 46 natural elements make up 1/2 periodic table.
Artificial elements.
A Periodic table The Periodic Table of the Elements.
atomic number
Because they are natural elements of earth.
Yes, all the elements (natural or artificial) are contained in the periodic (Mendeleev) table of the elements.
It is called the Periodic Table of Elements.
By grouping the elements on the Periodic Table.
See the link below fot the IUPAC model of the periodic table of elements.
Elements of the Periodic Table
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
Russian chemist Dmitri Mendeleev (1834-1907) published the first periodic table of elements in 1869.