What are group 1A and 2A elements found in many compounds but not group 8A elements?

Answer 1

Group 1A and 2A elements are alkali and alkali earth elements and are very reactive. Group 8A elements are the noble gases and are very non-reactive. If you are asking the reasons why groups 1 and 2 A are reactive and group 8A aren't, that's a different discussion altogethert.