Q. Which method does Dobereiner used to categorize elements?
Solution:
- Around 53 elements were discovered at the time of Dobereiner triads.
- Dobereiner could classify only three such triads of (Ca, Sr, Ba) ; (Li, Na, K) and (Cl, Br, I).
- Law of Triads: According to Dobereiner, when elements are arranged in increasing order of their atomic masses, the arithmetic mean of the atomic masses of the first and third element in a triad is approximately equal to the atomic mass of the second element in that triad.
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