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Question

Which of the following is not correct about Mendeleev's periodic table?

A
The position of hydrogen in the periodic table was uncertain
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B
It helped in correcting the doubtful masses of some elements including beryllium
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C
The isotopes were assigned specific places in the table
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D
Noble gases once discovered could be placed separately without disturbing the existing order
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Solution

The correct option is C The isotopes were assigned specific places in the table
Isotopes of an element have the same atomic number but a different mass number.

Mendeleev could not explain the position of isotopes in his periodic table and hence, their postions were uncertain.

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