How many elements were known at the time of Mendeleev?Name the elements which were not known at the time of Mendeleev, but when discovered later found to have the same properties predicated by Mendeleev.
On what basis, Mendeleev classify the elements? State Mendeleev's periodic law.
Why is classification of elements necessary?
What do you mean by classification of elements and periodic table of elements?
Which of the following iso-electronic species has largest size?
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