Initially, it was believed that the atomic mass of beryllium was $13$ . But Mendeleev suggested that its atomic mass should be $9$ .
i) Was Mendeleev suggestion correct?
ii) How had he reached to this conclusion?

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Solution

Yes,mendeleev's suggestion was correct.
Because,first we have taken hydrogen as the standard to find the masses of different elements but it don't give us the correct value of masses of different elements.Then we have taken oxygen as our standard then we face the same problem.At last,we have taken $12$ isotope at carbon,as our standard.By this we get the correct value of masses of different elements.

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Initially, it was believed that the atomic mass of beryllium was 13. But Mendeleev suggested that its atomic mass should be 9.i) Was Mendeleev suggestion correct?ii) How had he reached to this conclusion?

Initially, it was believed that the atomic mass of beryllium was $13$ . But Mendeleev suggested that its atomic mass should be $9$ .
i) Was Mendeleev suggestion correct?
ii) How had he reached to this conclusion?