How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table?

Explanation

Various anomalies of Mendeleev's Periodic Tablic removed as follows in the Periodic Table.
Elements are arranged in the increasing order of their atomic number in Modern Perioidc Table thus there was no. need for keeping more than one elements in one slot.
In the Modern Periodic Table there was no problem of the place of isotopes, as isotopes have same atomic mass with different atmic numbers.
Elements having same valence electron are kept in same group.
Elements having same number of shelts were put under the same perioid.
Position of hydrogen became clarified in as it is kept in the group with the elements of same valence electrons.