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Question

Elements A (35.5u), B (81u) and C follow the Döbereiner's triad. Determine the atomic mass of Element C. 


  1. 106.5
  2. 58.5
  3. 126.5
  4. 128


Solution

The correct option is C 126.5

In a triad, the atomic mass of the central atom is nearly an average of the other two atoms. In the triad of elements A, B and C, the mass of ‘B’ will be the average mass of ‘A’ and ‘C’.

Atomic mass of the middle element (B) = (Atomic mass of A + Atomic mass of C)/2

Atomic mass of C = (Atomic mass of B X 2) - Atomic mass of A

Atomic mass of C = (81 X 2) - 35.5 = 126.5 ≃  127u.

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