Which of these are demerits of Mendeleev's periodic table?

Options :
  1. Isotopes were not given seperate places
  2. Positions of some elements was not justified
  3. Lanthanides and actinides were not included in the table
  4. all of these
Answer and Explanation :-

Answer: Option 4


Sorry there is no explanation for this answer. Please help others by posting your response below

How do you rate this queston?  Very Easy  Easy  Average  Above Average  Tough

Previous Question : Scientists responsible for the development of periodic table?

Next Question : Elements belonging to the same group of periodic table have

Click here for online test on Chemical Periodicity


 (Getemail alerts when others member replies)

I believe God is managing affairs and that He doesn't need any advice from me. With God in charge, I believe everything will work out for the best in the end. So what is there to worry about.
-Henry Ford