Question

Defect of Mendeleev's periodic

Answer 1

Explanation:

• There was no proper position of hydrogen
• Some of chemically dissimilar elements where group together
• No position of isotopes
• Some of the elements of hogher atomic weight was placed before lower
• No proper position of lantanides and actinides

HOPE IT HELPS .

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Answer 2

Explanation:

it was based on atomic weight not atomic number,it created confusion as istopes also exists with different mass numbers,ex.like nickel and nickel have same atomic mass ,anoumolous position of hydrogen,no separation between metals and non metals