The Russian chemist Dmitri Mendeleev's periodic tables are dated
1869 and 1871.
Where as the German, Julius Lothar Meyer brought out an
alternative periodic table in 1870.
Both tables are very similar, but were definitely independent
works.
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There is one standardized periodic table that is widely used in science and education. However, variations and alternative versions of the periodic table have been proposed over the years to highlight specific properties, trends, or categories of elements.