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Development of Modern Periodic Table

(A) Dobereiner's Triads: He arranged similar elements in the groups of three elements called triads.

(B) Newland's Law of Octave: He was the first to correlate the chemical properties of the elements with their atomic masses.

(C)        Lother Meyer's Classification: He plotted a graph between atomic masses against their respective atomic volumes for several elements. He found the observations

(I)                       Elements with similar properties occupied similar positions on the curve

(II)                   Alkali metals having larger atomic volumes occupied  the crests

(III)               Transitions elements occupied the troughs

(IV)               The halogens occupied the ascending portions of the curve before the inert gases and

(V)                   Alkaline earth metals occupied the positions at about the midpoints of the descending portions of the curve. Based on these observations, he concluded that the elements' atomic volumes (a physical property ) are the periodic functions of their atomic masses.

(D) Mendeleev's Periodic Table :

Mendeleev's Periodic Law :

The physical and chemical properties of the elements are the periodic functions of their atomic masses.

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