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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).

Certain Characteristic Properties Of Elements Can Be Foretold From Their Atomic Weights.

No Law Of Nature, However General, Has Been Established All At Once; Its Recognition Has Always Been Preceded By Many Presentiments.

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The Magnitude Of The Atomic Weight Determines The Character Of The Element, Just As The Magnitude Of The Molecule Determines The Character Of A Compound Body.