Which group of elements could be placed in Mendeleev’s periodic table later on, without disturbing the original order ? Give reason.

Question

Which group of elements could be placed in Mendeleev&#x2019;s periodic table later on, without disturbing the original order ? Give reason.

Philoid · Accepted Answer

Noble gas could be placed without disturbing the original order because they are unreactive. Due to this they could be placed in a separate group.