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Transcript
Electronic Structure and the Periodic Table
A. Bohr Model of the Atom
1. Solar System Model
2. Created to Fit a “Quantized” Picture of Energy Transfer
3. Basis: Noncontinuous Emission Spectra of the Elements
4. Basic Postulates
a. Electrons reside in certain allowed energy states
b. Energy absorption and emission by atoms is caused
by electrons “jumping” between energy states.
B. Quantum Model (Quantum Mechanics)
1. No Specific Orbits or Paths
2. Mathematical Description of Where the Electrons Are
3. Electrons Reside in Principal Energy Levels
Level
1 (K)
2 (L)
3 (M)
4 (N)
5 (O)
6 (P)
7 (Q)
Theoretical Number
Actual Number
of Electrons
of Electrons
2
8
18
32
50
72
98
2
8
18
32
32
18
8
4. Electron Configuration - The most probable and most
stable arrangement of electrons in an atom.
Core and Valence Electrons
Shapes of Atomic Orbitals