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Dobereiner's Triads

The arrangeme...

Question

The arrangement of elements in a group of three is known as ___________.

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Solution

A German scientist called Johann Döbereiner put forward his law of triads in 1817. Each of Döbereiner's triads was a group of three elements. The appearance and reactions of the elements in a triad were similar to each other.
Hence the arrangement of elements in a group of three is known astriads.

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