Question

Give one example of such triads.

Answer 1

Answer:

Such triads—including chlorine-bromine-iodine, calcium-strontium-barium, and sulfur-selenium-tellurium—were noted by the German chemist J.W.

Explanation:

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. ... This law did not hold good for elements with very low or very high atomic mass.

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