What is the significance of even odd series in Mendeleev periodic table?
What is even odd series in periodic table in 4 ,5 and 6 periods.
(In byju study material it is given that Mendeleev failed to explain it in his table)
How does the number of valence electrons vary on moving from left to right :
(i) in the first period of the periodic table ? (ii) in the second period of the periodic table ?