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Atoms
| Term | Definition |
|---|---|
| atom | Smallest part of an element that can be identified as that element |
| electron | negatively charged particle |
| proton | positively charged particle |
| neutron | neutral particle with no charge |
| atomic number | number of protons in the nucleus of an atom |
| nucleus | center or core of an atoms where protons and neutrons are located |
| atomic mass | total mass of protons and neutrons in an atom |
| mass number | number of protons and neutrons in the nucleus |
| isotope | atom with same number of protons, but different number of neutrons |
| energy level | place in an atom where an electron is most likely found |
| electron cloud | place where energy levels are located |