Which of the following sets of atomic masses do not correspond to Dobereiner's triad?
7, 23, 39
20, 38, 56
47, 91, 178
54, 95, 183
A
7, 23, 39
B
47, 91, 178
C
20, 38, 56
D
54, 95, 183
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Solution
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The atomic mass of the middle element should be the average of the atomic masses of the first and third elements. In case of C and D options, the atomic masses do not correspond to that rule.
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