Modern Atomic Theory
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Created by:
melinda342 on February 15, 2012
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22 terms
Terms | Definitions |
|---|---|
 Photoelectric effect | when a photon hits an atom and then the electrons are ejected |
| photon | packet of light energy |
| quantum | the amount of energy needed to move an electron from one energy level to another |
| amplitude | distance from the origin to a crest of trough |
| wavelength | distance between troughs or crests |
| frequency | the number of wave cycles per sec |
| electromagnetic spectrum | arrangement of electromagnetic radiation--including radio waves, visible light from the Sun, gamma rays, X rays, ultraviolet waves, infrared waves, and microwaves--according to their wavelengths |
| Quantum Mechanical Model | made by Schrodinger, one we currently use, predict electron behavior |
| Sublevels | indicates the type of orbital in each quantum energy level 1st energy level: -n is 1, energy level has 1 sublevel: s(1 orbital) 2nd energy level: n = 2, 2 sublevels, s and p(3 orbital) 3rd energy level: n=3; 3 sublevels; s, p, d(5) 4th e. level: n=4; 4 sublevels; s, p, d, f(7) |
| Orbitals | region around the nucleus where there is a 90% chance of finding an electron, can hold 2 electrons |
| Rutherford | gold foil experiment |
| Chromium | has 6 electrons by itself |
| Pauli exclusion rule | only 2 electrons per orbital |
| Aufbau Rule | lowest energy level filled first |
| Hund's Rule | fill in 1 per box, then go back and put the second |
| Copper/Chromium Exceptions | half filled and completely filled sublevels are more stable |
| Visible Light Spectrum | ROYGBIV |
| Quantum Numbers | The four numbers that define each particular electron of an atom. The Principle Quantum Number (n) describes the electrons' energy and distance from the nucleus. The Angular Momentum Quantum Number (l) describes the shape of the orbital in which the electron resides. The Magnetic Quantum Number (m describes the orientation of the orbital in space. The Spin Quantum number describes whether the spin of the electron is positive or negative. |
| DeBroglie | wave particle duality |
| plank's constant | 6.63 X 10^-34 joules X seconds |
| wave speed | 3.010^17nm = wave lengthfrequency |
| photon equation | plank's constant*frequency |
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