From which group in the periodic table, noble gases does belong?

Q. Which of the following is the correct sequence of the noble gases in their group in the periodic table?

Q. (a) State the periodic law on which Mendeleev's periodic table table was based. Why and how was this periodic law changed?
(b) Explain why, the noble gases are placed in a separate group.

Q. . Which main group elements have a different numberof outermost electrons than its group number ofMendeelev's periodic table?(1) Noble gases 2) Halogens(3):0x gen family (4)", Nitrogen family

Q. Noble gases are placed extremely left in the periodic table.