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Newland's law of octaves :  Elements when arranged in increasing order of their atomic weights show resemblence in physical and chemical properties between the eighth element and the first element (similar to the eighth and first notes on a musical scale ).

The eighth element from lithium is sodium and from fluorine is chlorine -which show similarities in properties .

Method showed odd grouping and failed -to leave spaces for undiscovered elements .

Method of classification showed meaning with light metals example  ,lithium and sodium -but failed with heavy metals beyond potassium