alleryUp to which element was Newlands' law of octaves found to be applicable?
AIron
BThorium
CHydrogen
DCalcium
Answer & Solution
Correct answer: D. Calcium
1. Newlands arranged elements from hydrogen up to thorium.
2. The octave pattern held only for the lighter elements.
3. The law broke down beyond calcium for the heavier elements.
4. Rule out B: thorium was the last element listed, not the limit of validity.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.26_
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