Class Opener: Tues., Oct. 14 th **on back of new notes**. Summarize Bohr’s model of electron arrangement. Provide a drawing that illustrates Bohr’s model. What is the major problem with this model?. Quantum Mechanical Model.
Certain properties of matter can only be explained using a wave model.
Example - diffraction of electrons (electron microscope)
In 1924, Louis de Broglie developed an equation that predicts that all moving objects have wave-like behavior.
These wave properties are significant when particles are extremely small (such as electrons).
Like light, electrons exhibit a dual wave-particle nature.
Quantum mechanics describes the motions of subatomic particles and atoms as waves.
Later, Werner Heisenberg concluded that it is impossible to know exactly both the velocity and the position of an electron or any other particle at the same time. (Heisenberg uncertainty principle)
The Heisenberg Uncertainty Principle extremely small (such as electrons).
1st energy level = 1 orbital
2nd energy level = 4oribitals
3rd energy level = 9orbitals
4th energy level = 16 orbitals
Bohr model Quantum mechanical model
You have one minute to answer these two questions concerning today’s lesson.
What was the most important thing you learned?
What is still muddy?