Which of the following is not correct for Mendeleev periodic table?

Element properties were a periodic function of their atomic numbers

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It could predict the existence of other elements and left spaces for them

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The position of isotopes were not fixed

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Hydrogen element was not properly placed

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Solution

The correct option is A Element properties were a periodic function of their atomic numbers
Mendeleev formulated a law which states that properties of elements are the periodic function of their atomic masses.

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Which among the following chemical characteristics of elements was used by Mendeleev for giving the classification of his periodic table?

Mendeleev predicted the existence of which element/elements in the periodic table?

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