In 1869 chemist Dmitri Mendeleev（门捷列夫） (1834-1907) first presented his periodic table, an arrangement of chemical elements in order of increasing atomic mass. Today there are 118 elements in the table. He was nominated for a NobelPrize in 1906.
In 1869 chemist Dmitri Mendeleev（门捷列夫） (1834-1907) first presented his periodic table, an arrangement of chemical elements in order of increasing atomic mass. Today there are 118 elements in the table. He was nominated for a NobelPrize in 1906.