Actually, i think, (i'm really not sure) the smallest form of measurement is the mole...one mole equals 6.02*10^23...i guess it's not the smallest form of measurement because that's a huge number but the thing is you can't just have a mole, you have to have a mole of something...and usually that something is atoms...maybe i'm totally going in the wrong direction but i remember learning about moles in chemistry...however i got a C+ in that class...just throwing it out there because it sounds like moles are related to this convo!