How do the representative elements exhibit chemical reactivity? 

Among the following inert gas elements, the elements that shows highest chemical reactivity is

Why do transition elements exhibits characteristic properties ?

With the help of Born-Haber cycle, explain the chemical reactivity of halogens.

How do transition metals exhibit catalytic activity?

Which element exhibits highest catenation ability?

How do they (elements) usually exist?

Which gaseous element exhibits allotropy?

Why are some elements chemically inert?

Why do the transition elements exhibit higher enthapies of atomisation ?

What do you mean by representative elements? Name the groups of the periodic table, which contain representative elements.