What were the main demeris of mendeleev's periodic table?
(i)Hydrogen has been places in group I though it resembles to group VII as well
(ii)Position of some elements was not justified
(iii)Isotopes were not given separate places.
(iv)Lanthanides and actinides were not included in the table.

The position of hydrogen in Mendeleev's periodic table is not fixed but is anomalous because it resembles the elements of both groups:

How were transition elements placed in 0 Mendeleev's Periodic Table and (ii) Modern Periodic Table?

Mebdeleev's periodic table has helped in correcting the doubtful atomic masses of some elements such as (i) beryllium (ii) indium (iii) tellurium (iv) gold

The following are some statements about Mendeleev's peridioc table (i) It is based on increasing order of atomic numbers . (ii) Mendeleev corrected the atomic weight of some elements like Be, In, U, etc. (iii) (Ar, Ca), (Co, Cu), (Te , F) are three inverted pairs. (iv) it is based on increasing order of atomic weights.

In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later ?

In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later ?

In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later ?