Why are zero group elements chemically inert ?

Why are some elements chemically inert?

Why are zero group elements called noble gases or inert gases?

Why zero group elements are inert ?

Which element are Chemically inert?

Nitroeng is chemically inert. Why?

What are zero group elements ? Give the electronic configuration of the first four of them. Why zero group elements are also known as inert gases ?

Why group 18 elements are called inert gases ? Write the general electronic configuration of group 18 elements.