FPC Atomic Structure - Ch 4
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18 terms
Terms | Definitions |
|---|---|
 nucleus | dense, positively charged mass located at the center of the atom |
| Dalton's Atomic Theory | all elements are composed of atoms which cannot be subdivided - billiard ball model |
| Thomson's Atomic Model | discovered electrons - chocolate chip ice cream model |
| Rutherford's Atomic Theory | all of an atom's mass is concentrated in its nucleus |
| proton | positively charged subatomic particle with a mass of 1 amu - located in the nucleus |
| electron | negatively charged particle with a mass of 1/1836 amu - located orbiting the nucleus |
| neutron | neutral subatomic particle with a mass of 1 amu - located in the nucleus |
| atomic number | the number of protons located in the nucleus of an atom |
| mass number | the number of protons & neutrons (nucleons) located in the nucleus of an atom |
| isotopes | atoms with the same atomic number but different mass number - i.e., different number of neutrons |
| energy levels | the possible energies that electrons in an atom can have |
| electron cloud | a visual model of where electrons are likely to be located in an atom - contains all the orbitals |
| orbital | part of the region of an electron cloud where electrons are located |
| electron configuration | the arrangement of electrons in an atom |
| ground state | when all of the electrons in an atom have the lowest possible energies |
| Bohr's Atomic Model | electrons orbit in distinct levels - solar system model |
| Subatomic Particles | Protons, electrons, and neutrons. |
| Number of Neutrons | Mass number minus the Atomic number |
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