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Mendeleev did not always list elements in his periodic table in order of increasing atomic mass because he grouped together elements with similar
atomic numbers
densities
properties
colors
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properties
Mendeleev prioritized grouping elements with similar chemical properties (valence and reactivity), so he sometimes reversed the order by atomic weight to keep those groups intact.
Mendeleev prioritized grouping elements with similar chemical properties (valence and reactivity), so he sometimes reversed the order by atomic weight to keep those groups intact.
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