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Combo with "Chemistry ~ Chapter 13" and 1 other
Terms in this set (133)
- Atoms are indivisible particles
- Discredited by the discovery of subatomic particles (protons, electrons, neutrons)
JJ Thomson's Plum Pudding Model
- Discovered electrons
- The atom is made up of a positive substance (pudding) with negative electrons floating around (plum)
-Discredited by Rutherford's experiment
- Demonstrated that the positive charge was concentrated in the core of the atom (nucleus)
- Electrons moved around in the empty space of the atom surrounding the nucleus
Issue with Rutherford's Model
Neil Bohr questioned why don't the electrons fall into the nucleus (opposites should attract)
Neil Bohr's Planetary Model
- Proposed that electrons move like planets around the sun
- In circular orbits at different energy levels
- Electrons exist on specific energy levels
- Electrons cannot exist between energy levels
- The region around the nucleus where the electron is most likely to be moving
- Like rungs of a ladder
- The amount of energy required to move an electron from its present energy level to a higher energy level
Is the energy level higher or lower when farther from the nucleus?
Farther from the nucleus -> higher energy level
(Think magnet on the board has the lowest energy when stuck on the board)
Is the energy level higher or lower when closer to the nucleus?
Closer to the nucleus -> lower in energy
Quantum Mechanical Model
- Proposed by Erwin Schrodinger
- Equation described the energy and position of the electrons in an atom
- Has energy levels for electrons
- Orbits are not circular
- Predicts the probability of finding an electron in a region of space and not the pathway of an electron
What 2 properties did Schrodinger's equation describe?
As energy levels increase, do they get closer together or farther apart?
As the energy levels increase, the energy levels become close together
Do energy levels closer to the nucleus or farther from the nucleus have lower energy?
Energy levels closer to the nucleus have lower energy than those farther from the nucleus
If an electron has too much or too little energy, will it promote to the a higher energy level?
No, an electron will no promote to a higher energy level if it has too much or too little energy
The electron of an atoms is never in between energy levels so the electron has to make a jump between energy levels
(Think going b/w classrooms w/o using hallway)
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