Why are the elements of zero group inert?

Why are the elements of group 18 called noble gases?

Why are the elements of group 17 called halogens?

Name two elements of each group.

What are inert elements ?

Why does the first element of a group differ from the other elements of the same group ?

Why does boron differ from other elements of its own group in several properties?

Elements of group 14

Chalcogens are elements of the group

Explain why the elements of the same group exhibit the same chemical behaviour.

Why are the melting and boiling points of C and Si much higher as compared to those of other elements of the group ?