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Elements Which Are Similar As Regards Their Chemical Properties Have Atomic Weights Which Are Either Of Nearly The Same Value (eg. Pt, Ir, Os) Or Which Increase Regularly (eg. K, Ru, Cs).

We Must Expect The Discovery Of Many As Yet Unknown Elements-for Example, Elements Analogous To Aluminum And Silicon- Whose Atomic Weight Would Be Between 65 And 75.

The Elements Which Are The Most Widely Diffused Have Small Atomic Weights.

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If All The Elements Are Arranged In The Order Of Their Atomic Weights, A Periodic Repetition Of Properties Is Obtained. This Is Expressed By The Law Of Periodicity.