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Question
State one example of a Dobereiner's triad, showing in it that the atomic mass of middle element is half-way between those of the other two.
Solution
Lithium (Li), sodium (Na) and potassium (K) with atomic masses 7, 23, 39 constitute a Dobereiner's triad. The atomic mass of sodium (middle element) is half-way between those of the other two. This can be seen in the illustration below:
Average of the atomic masses of lithium and potassium =
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RELATED QUESTIONS
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.
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