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Achievements of Mendeleev’s Periodic Table

Which group o...

Question

Which group of elements could be placed in Mendeleev’s ′ Periodic Table without disturbing the original order? Give reason.

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Solution

Noble gases
Noble gases (group- $18$ ) can be placed in Mendeleev's Periodic Table without disturbing the original order.
They are chemically unreactive.
They got a place in the periodic table in the form of a separate group.
They are stable in nature.
Hence, they don't disturb the order of Mendeleev's Periodic Table.

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