Dimitri Mendelev, there is the element, Medelevium, number 101.
Dmitri Mendelev was a Russian scientist who created the first modern periodic table of elements.
D. Mendelev
He made the first periodic table.
For a better understanding and way to organize the elements. Research Mendelev.
he changed it
This is from wikipedia: Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869, who intended the table to illustrate recurring ("periodic") trends in the properties of the elements.
a scientist and the creator of the periodic table.
Dimitri Mendeleev
if you mean who: dmitri mendelev
mendelev arranged the elements in the periodic table in the asending order of the mass number of elements.
1869, after the Dimitri Mendeleev discovery.