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Dobereiner's groups of three similar elements were called:
ATriads
BOctaves
CPeriods
DBlocks
Answer & Solution
Correct answer: A. Triads
1. He noticed similar properties running in sets of three elements.
2. Each such set of three was called a triad.
3. He set these out by 1829.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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