Science Art: Atom Nucleon

by Shymaahemdan, Wikimedia Commons

by Shymaahemdan, Wikimedia Commons

“Atom” used to be the indivisible unit of matter, the thing smaller than which it was impossible to go. Now we know there are things inside atoms – neutrons, protons, electrons – and things that those things are made of. A nucleon (which is the stuff a nucleus is made of – protons and neutrons) is made of quarks – up and down quarks, specifically.