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Which among the following has no place in Mendeleev's periodic table?

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Isobars

Hydrogen

Isotopes

Alkali metals

answer is C.

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Detailed Solution

Isotopes have no place in Mendeleev's periodic table.

In Mendeleev's periodic table elements are arranged according to atomic mass. Isotopes have similar atomic numbers but different atomic masses therefore cannot be placed in Mendeleev's periodic table

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