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Chemistry

What was Dobereiner's basis of classification of elements. State Dobereiner's Law of Triads with suitable examples.

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Answer

Dobereiner arranged elements in increasing order of atomic weights - in groups of three called 'triads'.

Dobereiner's Law of Triads — Chemically analogous elements arranged in increasing order of their atomic weights formed well marked groups of three called 'triads' in which the atomic weight of the middle element was found to be generally the average [arithmetic mean] of the atomic weights of the other two elements.

Examples :

ElementsLithiumSodiumPotassium
Atomic weight7.023.039.0

Atomic weight of sodium is the average (arithmetic mean) of Lithium and Potassium.

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