Question

3 defects of mendeleef's periodic table followed by their rectification in the long form of periodic table

Answer 1

• Concentrated more on atomic weight
• Left many empty spaces
• There was no space for isotopes of an element

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Answer 2

Answer:

He was unable to locate HYDROGEN in periodic table.

Increase in atomic mass was not regular.

Some elements were yet to be discovered in which their properties unpredictable so, he left some spaces.

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