Question 41

Elements A, B and C occur as Dobereiner’s triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

According to Dobereiner's triad,
(A + C) ÷ 2 = B
Here,
A = 7
C= 39
B= ?
Therefore,
(7 + 39) ÷ 2 = C
46÷2 = C
23 =C

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