Terms : Hide Images
| 4757524958 | electron | A subatomic particle that has a negative charge. |  | 0 |
| 4757525083 | proton | A subatomic particle that has a positive charge and that is found in the nucleus of an atom. |  | 1 |
| 4757525191 | neutron | A subatomic particle that has no charge and that is found in the nucleus of an atom. | | 2 |
| 4757525398 | nucleus | Center of an atom. | | 3 |
| 4757526174 | quark | Particles of matter that make up protons and neutrons | 4 | |
| 4757527148 | chemical reaction | A change in which one or more substances are converted into new substances. |  | 5 |
| 4757527778 | nuclear reaction | A reaction that involves a change in the nucleus of an atom |  | 6 |
| 4757529698 | radioactivity | A form of energy released as atoms decay. |  | 7 |
| 4757530344 | radioactive decay | A spontaneous process in which unstable nuclei lose energy by emitting radiation |  | 8 |
| 4757532716 | fission | The splitting of an atomic nucleus to release energy. |  | 9 |
| 4757532866 | fusion | Creation of energy by joining the nuclei of two hydrogen atoms to form helium. |  | 10 |
| 4757533833 | E= mc^2 | Einstein's formula? |  | 11 |
| 4757535513 | Isotope | Atoms of the same element that have different numbers of neutrons |  | 12 |
| 4757537797 | Conservation of mass | Mass cannot be created or destroyed |  | 13 |
| 4766427036 | Energy shells | The orbital paths of electrons found at varying distances from the nucleus |  | 14 |
| 4766428510 | Photometry | Photometry describes the measurement of visible light. |  | 15 |
