Question

two drawbacks of mendeleev periodic law

Answer 1

position of hydrogen . , position of isotope

Answer 2

hi...here they are..
>>1. Mendeleev’s periodic table does not provide a clear idea about the structure of atom.
>> 2.. Lanthanide and Actinide have been assigned places in the periodic table which is against the periodic law.
>> 3. Alkali metal and coinage metals (Cu, Ag and Au) which differ widely in properties are placed into the same group.....

hope this helps...