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Physics Ch. 16
Term | Definition |
---|---|
Democritus | atomist, created the Particle Theory of Matter |
Aristotle | created the Continuous Theory of Matter |
Joseph Louis Proust | Law of Definite Proportions |
John Dalton | core envelope model |
J.J Thompson | plum pudding model, discovered electrons |
Rutherford | rutherford model, discovered protons |
Chadwick | discovered neutrons |
Niels Bohr | planetary model (1st shell-2, 2nd shell-8, 3rd-18) |
Quantum Model | most current |
Orbitals | subregions of space around the nucleus of an atom |
Protons | the # determines what atom you have |
Atomic Number | the number of protons |
Neutrons | the # can be different in the the same element |
Isotopes | different numbers of neutrons |
Isotopic Notation | (mass) 14 C (atomic # ) 6 |
Mass Number | the number of protons and neutrons |
Nucleons | protons and neutrons in the nucleus |
Electrons | SMALLEST mass, |
If the atom is neutral over all... | there will be an equal number of protons and electrons |
(for electrons) The farther away from the nucleus... | the more energy it has |
Valence Electrons | electrons in the highest energy level of an atom |
Octet Rule | an atom is happiest when it has 8 electrons in its valence shell |
Atomic Mass | the mass of the particle (weighted average of the masses of all the different isotopes) |
nuclear Radiation | radioactivity or the emission of rays and particles by unstable nuclei. |
Nuclear Chemistry | the study of changes in that occur in the atomic nuclei |
Alpha Particles | composed of 2 protons and 2 neutrons, positive charge |
Beta Particles | free nuclear electrons produced by decay on neutrons into protons and electrons, negative charge |
Gamma Decay | shedding of excess energy by emitting a gamma ray 0 y (number will stay the same ;) 0 |
Alpha Decay | the atoms nucleus loses 2 protons and 2 neutrons 4 H (remember to subtract with these kinds of equations) 2 |
Beta Decay | no change in the mass number, increase of atomic # by 1 0 e -1 (this one is really addition (+1) bc a negative + negative is a positive) |
Nuclear Fission | when a nucleus splits |
Nuclear Fusion | joining 2 nuclei together (Hydrogen bombs are made from this) |