RRB Group D 16 Sep 2022 Shift 3 Solved Paper

Question : 98 of 100

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What is the main limitation of Mendeleev’s periodic table?

Mendeleev’s Periodic Table contains vertical columns called groups and horizontal rows called periods.
Mendeleev selected hydrogen and oxygen as they are very reactive and formed compounds with most elements.
No fixed position can be given to hydrogen in the Periodic Table.
Nobel gases could be placed in a new group without disturbing the existing order.

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