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When the noble gases were discovered late in the nineteenth century, how were they accommodated in Mendeleev's table?
AThey were placed in group VII with the halogens
BA 'zero' group was created without disturbing the original table
CThe entire table was then rearranged by atomic number
DThey were added to the lanthanide series
Answer & Solution
Correct answer: B. A 'zero' group was created without disturbing the original table
1. Mendeleev's original table had no place reserved for noble gases.
2. When helium, neon and argon were found, a new 'zero' group was made.
3. The noble gases fitted there without disturbing the rest of the table.
4. Rule out C: rearranging by atomic number is the modern table, formed later.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.28_
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