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Which was a recognised limitation of Newlands' octaves?
AIt left vacant boxes for the undiscovered elements
BIt had no provision to accommodate newly discovered elements
CIt was based on the number of protons
DIt correctly placed all the transition metals
Answer & Solution
Correct answer: B. It had no provision to accommodate newly discovered elements
1. Newlands fixed all known elements into a rigid 7 x 8 table of 56 boxes.
2. With no spare boxes, later-discovered elements could not be fitted in.
3. Their properties also did not match the octave pattern.
4. Rule out A: leaving vacant boxes was a merit of Mendeleev, not Newlands.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.26_
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