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Which of the following elements do not fit in Dobereiner’s triad?

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Fluorine

Chlorine

Bromine

Iodine

answer is A.

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Detailed Solution

Johann Wolfgang Döbereiner in earlier attempts of classification, classified metals into small groups of 3 elements each, called triads.

He made these triads in order to put elements with similar physical properties together. In a triad, usually, the mass of the middle element was an average of the masses of the heaviest and lightest elements of the triad.

In Cl (35.5), Br (79.9), and I (126.9), Br has an average mass of Cl and I. So, it depicts a Doberiener’s triad. Fluorine does not fit in this triad.

Hence, Fluorine is an element that does not fit in Dobereiner’s triad.

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