hi, i have been reading this book about antimatter, "Antimatter" by Frank Close, and have a question. CAN ATOMS BE COMPRISED OF DIFFERENT FERMIONS OTHER THAN PROTONS, NEUTRONS, AND ELECTRONS? could they be comprised of those fermions if they have the same charges as protons, neutrons, and electrons, but were just bigger or smaller? sorry if the answer to this question is obvious. i have never taken a physics class and this is the first book about it that i have read. thanks.