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When The Elements Are Arranged In Vertical Columns According To Increasing Atomic Weight, So That The Horizontal Lines Contain Analogous Elements Again According To Increasing Atomic Weight, An Arrangement Results From Which Several General Conclusions May Be Drawn.
-Dmitri Mendeleev
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When The Elements Are Arranged In Vertical

Dmitri Mendeleev
When The Elements Are Arranged In Vertical Columns According To Increasing Atomic Weight, So That The Horizontal Lines Contain Analogous Elements Again According To Increasing Atomic Weight, An Arrangement Results From Which Several General Conclusions May Be Drawn.
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