What are the advantages and drawbacks of Mendeleev's periodic table?
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Answer:
Advantage of Mendeleev Periodic Table :- 1.He left blank Places which help scientist to discover new element 2.When Noble gasses was discovered Hel could add it to periodic table without any major changle 3.He predicted the property of new element Disadvantages :- 1. Couldn't explain position of Hydrogen 2.Couldn't answer the question "Can we have an element with atomic mass 3 between Hydrogen and Helium 3 He placed cobalt before Nickel though Cobalt has more mass
1:-----he did not explained the position of isotopes,
like:-2 isotopes of chlorine are cl-35, cl-37
these having two atomic masses in the same group
2:-----wrong order of atomic masses of some elements could not explained
see in group no. 8
3:-----a correct position could not be assigned to hydrogen in the periodic table]