Three elements A, B and C have similar properties. The properties of middle element B are somewhere in between A and C. Moreover, the atomic mass of B is average of A and C. What is such a type of arrangement of elements called as?

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Newlands’ Law of Octaves.

Döbereiner’s Triads

Modern Periodic table

Mendeleev’s Periodic Table

answer is B.

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Detailed Solution

The given arrangement of elements is called dobereiner’s triad.
Döbereiner’s Triads are groups consisting of three elements (triads) that have similar chemical and physical properties. Dobereiner called this grouping method the law of triads. In every triad, the atomic weight of the middle element was half of the sum of the atomic weight of the other two elements. Properties of the middle element were also in the halfway of both the elements.

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