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→About The Periodic Table
===About The Periodic Table===
: The modern [[Periodic Table]] is based on an earlier [[Periodic Table]] made by a scientist called [[Mendeleev]]. Others had tried to arrange all the [[element]]s before, but [[Mendeleev]] was the first to correctly arrange it by both [[Relative Atomic Mass]] and [[Chemical Property|chemical properties]]with gaps where [[element]]s were later discovered.
: The modern [[Periodic Table]] is only slightly different and is arranged by [[Atomic Number]] and [[Chemical Property|chemical properties]].
: The columns of the [[Periodic Table]] are called [[Group (Chemistry)|group]]s.