| Term | Definition |
|---|
| John Dalton | atoms are tiny, solid, spheres |
| JJ Thomson | atoms are positive spheres with negative charges embedded in them |
| Ernest Rutherford | atoms have a positive center with electrons orbiting them |
| Neils Bohr | electrons occupy energy levels in the atom |
| nucleus | contains the protons and the neutrons |
| electron | negatively charged particle found in the energy levels |
| proton | positively charged particle |
| neutron | subatomic particle with no charge |
| electron cloud model | the elctrons form a field of electronegativity around the nucleus |
| atom | smallest part of an element |
| Mendeleev | made the first periodic table |
| atomic number | the number of protons in an atom of an element |
| atomic mass | the sum of the protons and neutrons |
| family/group | a vertical row on the periodic table |
| period | horizontal row on the periodic table |
| electron cloud model | nucleus is surrounded by negative charge |
| isotopes | atoms with the same # of protons but different # of neutrons |
| Chadwick | discovered the neutron |
| ion | formed when an atom loses or gains electrons |
| model | a diagram, mental picture or matematical statement |
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