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===About The Periodic Table===
: The modern [[Periodic Table]] was arranged by a scientist called [[Mendeleev]]. Others had tried to arrange all the [[element]]s before, but [[Mendeleev]] was the first to arrange by both [[Atomic Number]] and [[Chemical Properties of ElementsProperty|chemical properties]].
: The columns of the [[Periodic Table]] are called [[Group]]s.
: The rows of the [[Periodic Table]] are called [[Period (Chemistry)|Period]]s.