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Development of Periodic Table

The source opens with early periodic classifications and Mendeleev's periodic law.

Classification	Source-backed point
Dobereiner's triads	Similar elements arranged in groups of three.
Newland's law of octave	Chemical properties were correlated with atomic masses.
Lother Meyer's classification	Atomic masses were plotted against atomic volumes.
Mendeleev's table	Properties were treated as periodic functions of atomic masses.

Mendeleev's periodic law: physical and chemical properties of elements are periodic functions of their atomic masses.