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What was the main limitation of Dobereiner's triads as a method of classifying elements?
AIt could only classify the noble gases
BIt used atomic number instead of atomic mass
CIt placed metals and nonmetals together
DAll known elements could not be arranged into triads
Answer & Solution
Correct answer: D. All known elements could not be arranged into triads
1. Dobereiner could form only a few triads such as (Li,Na,K) and (Cl,Br,I).
2. Most known elements did not fit into any group of three.
3. So the system failed to classify all elements, its chief drawback.
4. Rule out B: triads were explicitly based on atomic mass, not atomic number.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.25_
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