Question

If Cl (35); Br (?); I (126) form a Dobereiner’s triad, then what could be the possible atomic mass of Bromine (Br)?

Answer 1

Answer:

80.5

Explanation:

Dobereiner's Triad states that the mass of the middle element of the triad is equal to mean of the other two elements in the triad.

Given,

Cl = 35

I = 126

Mass of bromine = $\frac{35+126}{2} = \frac{161}{2} = 80.5$

Answer 2

Answer:

Atomic mass of Bromine (Br) = 81.2.