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Chlorine, bromine and iodine form a Dobe...

Chlorine, bromine and iodine form a Dobereiner's triad . Chlorine has atomic mass 35.5 and iodine has atomic mass 126.9 . Predict the atomic mass of bromine.

Text Solution

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As chlorine (CI), bromine (Br) and iodine (I) form a triad, atomic mass of Br should be the mean of atomic masses of CI and I .
`therefore` Atomic mass of Br` = (35.5+126.9)/(2)=81.2`
`therefore` Atomic mass of Br would be approximately 81 (actual mass is 79.9).
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