Quantum Model of the Atom

1
Quantum Model of the Atom

• Ch. 4 - Electrons in Atoms

2
A. Electrons as Waves

• Louis de Broglie (1924)
• Applied wave-particle theory to e-
• e- exhibit wave properties

QUANTIZED WAVELENGTHS
3
A. Electrons as Waves
QUANTIZED WAVELENGTHS
4
A. Electrons as Waves
EVIDENCE DIFFRACTION PATTERNS
5
B. Quantum Mechanics

• Heisenberg Uncertainty Principle
• Impossible to know both the velocity and position
  of an electron at the same time

6
B. Quantum Mechanics

• Schrödinger Wave Equation (1926)
• finite of solutions ? quantized energy levels
• defines probability of finding an e-

7
B. Quantum Mechanics

• Orbital (electron cloud)
• Region in space where there is 90 probability of
  finding an e-

8
B. Quantum Mechanics

• Four Types of Orbitals

1 3 5 7
9
C. Quantum Numbers

• Orbitals combine to form a spherical shape.