Quantum Model of the Atom

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Presentation transcript:

Quantum Model of the Atom Ch. 4 - Electrons in Atoms Quantum Model of the Atom

A. Electrons as Waves Louis de Broglie (1924) Applied wave-particle theory to e- e- exhibit wave properties QUANTIZED WAVELENGTHS

A. Electrons as Waves QUANTIZED WAVELENGTHS

A. Electrons as Waves EVIDENCE: DIFFRACTION PATTERNS VISIBLE LIGHT

B. Quantum Mechanics Heisenberg Uncertainty Principle Impossible to know both the velocity and position of an electron at the same time

B. Quantum Mechanics Schrödinger Wave Equation (1926) finite # of solutions  quantized energy levels defines probability of finding an e-

Radial Distribution Curve B. Quantum Mechanics Orbital (“electron cloud”) Region in space where there is 90% probability of finding an e- Orbital Radial Distribution Curve

B. Quantum Mechanics Four Types of Orbitals: f d s p 1 3 5 7

C. Quantum Numbers 2s 2px 2py 2pz Orbitals combine to form a spherical shape. 2s 2pz 2py 2px