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Because all of the elements are displayed; also they are divided into groups (alkali, alkaline earth, transition metals, metalloids, non metals, halogens, noble gases, lathanides and actinides) based on their reactivity, common oxidation states and properties. This helps chemists to think of chemical compounds and their composition (e.g alkali metals usually have +1 oxidation states, alkaline earth +2 and transition +2,+3, but are not limited to these oxidation states).

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12y ago

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