) State Dobereiner's law of traids giving one example.
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Dobereiner law of triads states that the average of the atomic masses of the first and third element in a triad will be roughly equal to the atomic mass of the second element in that triad. ... Three more triads were determined in the year 1829. For example: The atomic mass of calcium is 40g/mol.
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The atomic mass of the middle elements of the triad being equal to the arithmetic mean of the atomic masses of the other two elements. For example: Alkali metal group ( Dobereiner's triad) : Lithium is the 1st element, sodium is the middle element whereas potassium is the 3 rd element of the triad.
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