| A | B |
|---|
| Atom of an element that has the same number of protons as another atom of the same element but a different number of neutrons. | isotope |
| Particle that makes up all other known particles in the nucleus of an atom. | quark |
| Subatomic particle that has a positive charge and is found in the nucleus of an atom. | proton |
| Sum of the protons and neutrons in the nucleus of an atom. | mass number |
| Space in which electrons are likely to be found. | electron cloud |
| Small, dense positively charged center of an atom. | nucleus |
| Unit used to measure the masses of subatomic particles. | atomic mass unit |
| Negatively charged subatomic particle found in an area outside the nucleus of an atom. | electron |
| Number of protons in the nucleus of an atom. | atomic number |
| Most likely location in an electron cloud in which an electron can be found. | energy level |
| Subatomic particle with no electric charge that is found in the nucleus of an atom. | neutron |
| Proton, neutron, and electron. | subatomic particle |
| Answer to the Bonus Question!!! | Casey |
