Almost all the mass of an atom is located in its?

Which is an example of a highly unstable isotope that is often used in fission reactions?

Which statement is actually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Can you guys answer these questions i need it before 1: 00pm