When the noble gases were discovered late in the nineteenth century, h…

Question

When the noble gases were discovered late in the nineteenth century, how were they accommodated in Mendeleev's table?

Accepted 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_

Answer

They were placed in group VII with the halogens

Answer

The entire table was then rearranged by atomic number

Answer

They were added to the lanthanide series