Firstly these questions are quite simple. You should try to solve your homework by yourself. Secondly, I think I'm gonna help you.
1.Atom 2.Element 3.Pure substances 4.Mixture 5.Solutions are homogenous mixtures with particle sizes of less than 1nm Colloids are heterogenous mixtures with particle size of 1 to 1000 nm Suspensions are heterogenous mixtures with particle sizes above 1 micrometre
