Question

4)
X, Y, Z are the elements of Dobereiner's triad. If the atomic mass of X
is 7 and that of Z is 39. What should be the atomic mass of Y?​

Answer 1

The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. Elements X, Y and Z have atomic number 6, 9 and 12 respectively. The atomic numbers of three elements, X, Y and Z are 9, 11 and 17 respectively.

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