Terms : Hide Images
| 5027854870 | atom | the basic unit of matter | 0 | |
| 5027861311 | subatomic particles | protons, neutrons, and electrons | 1 | |
| 5027868225 | protons | positively charged particles found in the nucleus | 2 | |
| 5027874296 | neutrons | have no charge, are found in the nucleus | 3 | |
| 5027882452 | electrons | negatively charged particles found in the nucleus | 4 | |
| 5027888605 | protons and neutrons share | the same mass | 5 | |
| 5027899710 | there are always equal numbers of | protons and electrons | 6 | |
| 5027903752 | mass number | protons plus neutrons | 7 | |
| 5027908137 | atomic number | number of protons | 8 | |
| 5027915194 | Bohr's model |  | 9 | |
| 5027921151 | A decimal point in the mass number indicates | it has isotopes | 10 | |
| 5027925746 | Schroedinger's model |  | 11 | |
| 5027929202 | isotopes | different forms of an element: they contain the same proton(atomic)number, but different numbers of neutrons, making their mass numbers different | 12 | |
| 5027942892 | element | pure substance that contains only one type of atom | 13 | |
| 5027950551 | compound | substance formed by chemical combination of two or more elements in a fixed proportion | 14 | |
| 5245662627 | valence electrons | electrons found in the outermost energy level of an atom | 15 | |
| 5245665348 | octet rule | all atoms seek to have 8 valence electrons exception: hydrogen and helium which "want" and are satisfied with two | 16 |
