alleryWho put forward the law of triads?
ANewlands
BMendeleev
CDobereiner
DMoseley
Answer & Solution
Correct answer: C. Dobereiner
1. Dobereiner observed elements grouped in threes (triads) with similar properties.
2. The atomic mass of the middle element was the mean of the other two.
3. Newlands proposed the law of octaves later.
4. So Dobereiner gave the law of triads.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
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