Question

That were the main demerits of Mendeleev's periodic table? Hydrogen has been placed in group I though it resembled to group VII as well. ) Position of some elements was not justified. i) Isotopes were not given separate places. V) Lanthanides and actinides ware not included in the table. (i), (ii) and (iii) ). (ii), (iii) and (iv) (ii) and (iv) (i). (iii) and (iv)​

Answer 1

Answer:

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Answer 2

The demerits of the periodic table given by Mendeleev are :

• He could not place the element Hydrogen in appropriate position in the periodic tabular form.
• There was no regular trend in increasing of atomic mass when moved along the elements.
• More elements was yet to be known.

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