Question
Which of the following is a Dobereiner's triad?
Answer: Option C
:
C
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C
According to Dobereiner's law of triads, the atomic mass of the middle element of a triad is equal to the arithmetic mean of the atomic masses of the other two elements.
In the triad of lithium, sodium and potassium. The atomic mass of lithium is 7 and the atomic mass of potassium is 39. The arithmetic mean of atomic masses of lithium and potassium gives atomic mass of sodium i.e. 23.
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