Question

Initially It was believed that 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?

Answer 1

Explanation:

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Answer 2

(i) Beryllium was commonly initially given an atomic mass of 14, which was the same as that of nitrogen.

(ii) Mendeleev determined that the atomic weight of Beryllium is 9 and not 13.5 based on its position in the periodic table.

Explanation:

(i) However, depending on similarity of property, Mendeleev proposed that beryllium’s valency was incorrectly assigned and that its actual atomic mass should be a non-integer value of 9.4. This places Beryllium above magnesium in the periodic table.

(ii) Using the formula atomic weight = equivalent weight x valency, atomic weight = 4.5 x 2. This gives us the atomic weight as 9.

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