Give example for Döbereiner triad ?
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Answer:
Lithium is the first element of this triad, sodium is the middle element whereas potassium is the third element of the triad.
The elements lithium, sodium and potassium form a Dobereiner's triad. Lithium is the first element of this triad, sodium is the middle element whereas potassium is the third element of the triad. Sodium (middle element) has atomic mass 23.