Which among these are limitations of Mendeleev's periodic table?

Position of hydrogen

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Position of isotopes

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Similar elements placed separately

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None of These

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Solution

The correct options are
A
Position of hydrogen

B
Position of isotopes

C
Similar elements placed separately

Hydrogen has been placed in 1A group with alkali metals, but certain properties of hydrogen resemble those of halogens. Isotopes, such as that of hydrogen, carbon, etc., have not been given separate places in the periodic table because of their similar properties. Also, some similar elements have been placed separately in Mendeleev's periodic table. For example, chemically similar elements like Cu an Hg have been placed in different groups.

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Similar questions

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium?

(a) Name the elements which have taken the place of these elements.

(b) Mention the group and the period of these elements in the Modern Periodic Table.

_{17} C l^{35},_{17} C l^{37}

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