![]() Mendeleev was correct in guessing that more elements would be discovered, as new elements have been discovered as recently as 2016. In Mendeleev’s first periodic table, there were spaces left clear as he anticipated more elements would be discovered. ![]() His initial version of the periodic table arranged the elements in order of atomic masses as the nucleus of atoms had not yet been discovered.Īs knowledge about atoms and elements evolved, it became clear that it made more sense to arrange the periodic table by atomic number as this told us the most about the properties of each element. The most important initial version of the periodic table was first established in 1869 by chemist Dimitri Mendeleev. What is the history of the periodic table?
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