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: The [[Relative Atomic Mass]]es on the [[Periodic Table]] are an [[Mean Average|average]] [[Relative Atomic Mass|atomic mass]] of different [[isotope]]s of the same [[element]].
: The position of an [[element]] in the [[Periodic Table]] is a result of the [[Electronic Structure]] of the [[element]], which itself is due to the [[Atomic Number]] of the [[element]].
: The [[element]]s in each column of the [[Periodic Table]] all have the same number of [[electron]]s in the [[Outer Shell]] (except [[Helium]] in the [[Nobel Noble Gas]]es) which causes them all to have the same [[Chemical Property|chemical properties]]. These columns are known as [[Group (Chemistry)|group]]s.
: The [[element]]s in each row of the [[Periodic Table]] all have the same number of [[Electron Shell]]s. These rows are called [[Period (Chemistry)|period]]s.