Which group of elements could be placed in Mendeleev’s Periodic Table without disturbing the original order ? Give reason.
Group of noble gases (called zero group) could be placed in the Mendeleev’s Periodic Table with out disturbing the original order.
Reasons : Elements present in a group have same valency in the Mendeleev’s Periodic Table. Based on their electronic configuration, the
members of noble gas family have zero valency. That is why they are called inert gases. They could be easily placed in the Mendeleev’s Periodic
Table as a separate group without disturbing the arrangement of other elements.