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Limitations of Mendeleev’s Periodic Table

In Mendeleev'...

Question

In Mendeleev's periodic table, some elements with higher atomic masses were placed before the elements with lower atomic masses.

A

False

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B

True

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Solution

The correct option is B True

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Q. In Mendeleev's periodic table, some elements with higher atomic masses were placed before the elements with lower atomic masses.

Elements with higher atomic masses can be placed before elements with lower atomic masses in the modern periodic table.

Q. The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).

Q. Assertion (X): Mendeleev placed Co before Ni in the periodic table by violating the trend of increasing atomic mass

Reason (Y): The sequence was inverted to group the elements with similar properties together

Q. In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.69 amu. Reason for the same is that :

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Limitations of Mendeleev’s Periodic Table

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