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| 1. |
A,B,C are the elements of a dobereiner's triad. If the atomic mass of 'A' is 9 and that of 'C' is 39, what is the atomic mass of element 'B' ? |
| Answer» A,B,C are the elements of a dobereiner's triad. If the atomic mass of 'A' is 9 and that of 'C' is 39, what is the atomic mass of element 'B' ? | |