how to learn periodic table

How many elements are there in the 5^(th) period of modern periodic table ?

How have the shortcomings of Mendeleev's periodic table been overcome in the modern periodic table ?

Position of the elements in the periodic table: How did the position of ._(17)^(35)CI and ._(17)^(37)CI get fixed in the modern periodic table?

How many groups are there in the modern periodic table as per the latest IUPAC convention ?

How many elements are accommodated in the fifth period of the long form of the periodic table ?