Question

what are noble gases? why are they placed in a separate group in the modern periodic table ?​

Answer 1

Answer:

these are the gases which have a complete orbit and did not give and take electron hence they do not take part in chemical reactions

Answer 2

Answer:

1. noble gases are the elements which doesn't participate in reaction
2. They are very stable as they have 8 electrons in outermost shell(except helium)
3. They are placed separately in the periodic table as they don't participate in any reaction