atomic number
Chemical elements are organized in the form of the periodic table of Mendeleev, in groups and periods.
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When making his periodic table Mendeleev noticed some spaces where elements should be couldn't be filled. He didn't want to force elements that didn't belong there to go there, so he believed the spaces were undiscovered elements. He left the names blank but predicted their properties. Later the elements Mendeleev predicted existed were discovered.
The Periodic Table is organized by atomic number, metals, nonmetals, metalloids, periods, groups, and stability.
He is important because he was the person who invented the Periodic Table and made it how it is today
The most basic level that elements are organized on the periodic table is according to their atomic number. Elements were originally organized purely by mass but this led to some inconsistency due to the occurrence of isotopes.
fixed or organized or placed concentrated, condensed, gathered, organized