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Question
Which of the following can form Dobereiner’s Triads: with Li(u = 6.9) and Na(u = 23)?
Which of the following can form Dobereiner’s Triads: with Li(u = 6.9) and Na(u = 23)?
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Solution
The correct option is D K (m = 39)
By looking at the atomic masses of given elements and the options, you can tell that Lithium and Sodium are the first two elements of the triad. Thus 23 is the average mass.
The average of 6.9 and 39 is nearly 23.
Hence, the third element Li(u = 6.9), Na(u = 23) and K(u = 39) will form a Dobereiner’s Triad.
K (m = 39)
By looking at the atomic masses of given elements and the options, you can tell that Lithium and Sodium are the first two elements of the triad. Thus 23 is the average mass.
The average of 6.9 and 39 is nearly 23.
Hence, the third element Li(u = 6.9), Na(u = 23) and K(u = 39) will form a Dobereiner’s Triad.
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