Question

Give an example of Dobereiners triaids​

Answer 1

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.

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Answer 2

Answer:

• 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.

Explanation:

• Such triads—including chlorine-bromine-iodine, calcium-strontium-barium, and sulfur-selenium-tellurium—were noted by the German chemist J.W. ... Döbereiner between 1817 and 1829. The triad was the earliest atomic-weight classification of the elements.