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Mendeleev's Periodic Table

Which of the ...

Question

Which of the following is the drawback of Mendeleev’s periodic table :

A

The periodic table was unable to locate the position of hydrogen

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B

Iodine having lower atomic mass than Tellurium was placed ahead of Tellurium

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C

The known elements were arranged in the order of their increasing atomic masses

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D

All of these

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Solution

The correct option is D All of these
Mendeleev's table was unable to locate the correct position of Hydrogen in its periodic table since it resembled alkali metals as well as halogens.

Iodine (Atomic weight = $126.9$ ) having lower atomic mass than Tellurium (Atomic weight = $127.6$ ) was placed ahead of Tellurium because Iodine showed similar properties with Fluorine, Chlorine and Bromine.

Mendeleev arranged the elements in the order of their increasing atomic mass.

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Mendeleev's Periodic Table

Standard XII Chemistry

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