What is long form of the periodic table? Discuss in brief its salient structural features.

Why atomic number is a better basis for classifying the elements than atomic mass?

Why is long form periodic table regarded better than the Mendeleev's periodic table?

What are the defects of long form of the periodic table?

What would be the IUPAC name and symbol for the element with atomic number 120?

What are the advantages of classifying the elements into s, p, d and f-block elements?

Which element do you think would have been named by:
(i)  Lawrence Berkeley Laboratory
(ii) Seaborg's group?