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Periodic Classification of Elements

Periodic Classification of Elements > Ask Alfie
cee
Hi
What is Dobereiner's law of triads?
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cee
Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad. He also suggested that this law could be extended for other quantifiable properties of elements, such as density.
cee
Some of the learners also asked:
How many elements are known till date?
speak