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chapter 4
| Term | Definition |
|---|---|
| nucleus | a dense positively charged mass located in the center of the atom |
| proton | a positively charged subatomic particle |
| neutron | a neutral charged subatomic particle |
| electron | negatively charged subatomic particle |
| atomic number | number of protons in an element |
| mass number | |
| energy levels | possible energy electrons can have |
| electron cloud | most likely places for electrons to be |
| oribtal | area of space around the nucleus |
| electron configuration | the way electrons are arranged |
| ground state | when the electrons in an atom are at its lowest possible energy |
| isotopes | atoms of the same element that has a different number of neutrons and different mass numbers |