_________ were not included in Mendeleev's periodic table.

Alkali metals

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Isotopes

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Halogens

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Non-metals

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Solution

The correct option is A Isotopes
Mendeleev's table was based on the atomic masses of elements. There were some limitations of Mendeleev's periodic table as:
It could not explain the position of hydrogen in the table.
No position for isotopes was given.
Isotopes were discovered long after Mendeleev's periodic table. Isotopes of an element have similar chemical properties, but different atomic masses.

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Similar questions

The modern periodic table was prepared by :

(a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

Metallic character ___ down a group in a periodic table.

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