If Chlorine, Bromine, Iodine, is a Dobereiner's triad and the atomic masses of Chlorine and Iodine are 35.5u and 127u respectively, then find the atomic mass of Bromine.

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Solution

In a triad, the atomic mass of the central atom is nearly an average of the other two atoms. [1 mark]
In the triad Chlorine, Bromine, Iodine, the mass of Bromine is the average mass of Cl and I. [0.5 marks]

So, the atomic mass of Br = $\frac{35.5 + 127}{2} = 81.25$ [0.5 marks]

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If Chlorine, Bromine, Iodine, is a Dobereiner's triad and the atomic masses of Chlorine and Iodine are 35.5u and 127u respectively, then find the atomic mass of Bromine.

In a triad, the atomic mass of the central atom is nearly an average of the other two atoms. [1 mark] In the triad Chlorine, Bromine, Iodine, the mass of Bromine is the average mass of Cl and I. [0.5 marks] So, the atomic mass of Br = 35.5+1272=81.25[0.5 marks]

In a triad, the atomic mass of the central atom is nearly an average of the other two atoms. [1 mark]
In the triad Chlorine, Bromine, Iodine, the mass of Bromine is the average mass of Cl and I. [0.5 marks]

So, the atomic mass of Br = $\frac{35.5 + 127}{2} = 81.25$ [0.5 marks]