| A | B |
|---|
| element | substance with atoms that are alike |
| atom | smallest particle of element |
| nucleus | positively charged center of atom |
| proton | particles in nucleus, electric charged 1+ |
| neutron | neutrally charged particles in nucleus |
| electron | particles surround nucleus charge 1- |
| quark | smaller particles of protons & neutrons |
| electron cloud | area around nucleus with electrons |
