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Question

Chemistry Question on Classification of elements & periodicity in properties

Cl, Br, I, if this is Dobereiner?? triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Br is -

A

162.5

B

91.5

C

81.25

D

45.625

Answer

81.25

Explanation

Solution

According to Dobereneir?? triad the atomic mass of Br will be average of the atomic masses of Cl & I =35.5+1272=81.25 = \frac{35.5 + 127}{2} = 81.25