Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
|
Planck: Blackbody Radiation |
Energy is transferred in quanta/um, discrete packets of energy |
|
|
Bohr: Hydrogen Line Spectra |
1st postulate: electrons occupy levels (shells) around a nucleus 2nd postulate: electrons transition between levels as they absorb and release energy |
|
|
Einstein: Photoelectric Effect
|
To separate an electron, a strong enough photon of light must be absorbed to force the electron past the furthest orbital (highest energy level). |
|
|
de Broglie: [His] Theory |
Electrons act as both particles and waves Particles: when in contact with another particle Waves: When in transition of energy levels |
|
|
Schrodinger: [His] Wave Equation |
Created a mathematical representation of where electrons will be and their energyCreated a probability graph of 90% |
|
|
Zeeman: Spectral Line Splitting |
-Better technology revealed more spectral lines, not thicker lines and showed electron levels aren't pathways, but regions of space. -When spectral lines are exposed to a magnetic field, you can tell the electron orientation in the energy levels -Showed different electron orientations within energy levels |
|
|
Pauli: Paramagnetism (antiquity) |
Some electrons behave like a magnet only when exposed to a magnetic field Unpaired electrons forced to all spin the same way create a weak magnetic fieldNormally spin is random and can change all the time. |
|
|
Mendeleev: Periodic Table |
-Elements arranged in increasing atomic number showed repetition of properties. -Electron position and configuration is explained by position on table -All physical and chemical properties are due to electron configuration |
