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Which of the following is an achievement of Mendeleev's periodic table?

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Arrangement of metals according to their nature of oxides and hydroxides.

Placing isotopes of known elements in the same place of the original element.

Inclusion of inner transition elements.

Formation of a new group of noble gases after their discovery.

answer is D.

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Detailed Solution

One of the strengths of Mendeléev’s Periodic Table was that, when these gases were discovered, they could be placed in a new group without disturbing the existing order.

In the modern periodic table all noble gases are placed in group 18.

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