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The 19th century.
Dmitri Mendeleev performed his research during the year 1847.
When Mendeleev proposed his periodic table, the noble gases had not been discovered, so they did not play a part in his development of the periodic table.
Firstly, he didn't discover it; the periodic table was invented. Secondly, he wasn't the one to invent it - although his work did contributem that was done by Gregor Mendeleev.
Mendeleev's published the periodic table in 1869.
the periodic table.
mendeleev
Dmitri Mendeleev published his periodic table in 1869.
The 19th century.
Dmitri Mendeleev performed his research during the year 1847.
Mendeleev discovered old periodic table. He arranged elements in order of atomic masses.
something to do with protons and stuff.
Mendeleev arranged elements in order of atomic mass. He arranged elements in rows and columns that later helped in discovering modern periodic table.
Mendeleev invented the legendary periodic table and their is a university and chemical element named after him.
When Mendeleev proposed his periodic table, the noble gases had not been discovered, so they did not play a part in his development of the periodic table.
Mendeleev's published the periodic table in 1869.
Firstly, he didn't discover it; the periodic table was invented. Secondly, he wasn't the one to invent it - although his work did contributem that was done by Gregor Mendeleev.