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What is doberneir traid?

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What is doberneir traid?
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Yogita Ingle 5 years, 11 months ago

According to Dobereiner, all elements occurred in groups of three, when arranged in increasing order of atomic masses. He referred to these groups as triads. In a traid the elements had similar chemical properties. 

Traids of the Dobereiners classification:
Traid1:

Element Atomic mass
Lithium (Li) 7
Sodium (Na) 23
Potassium (K) 39

Dobereiner’s law of triads states that, the atomic mass of the middle element of a triad is the arithmetic mean of the atomic masses of the other two elements.
Example: In the triad of lithium, sodium and potassium. The atomic mass of lithium is 7 and the atomic mass of potassium is 39. The average of masses of lithium and potassium gives atomic mass of sodium 23.

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