Quantum Model of the Atom Electrons in Atoms. A. Electrons as Waves zLouis de Broglie (1924) yApplied wave-particle theory to e - ye - exhibit wave properties

Download Quantum Model of the Atom Electrons in Atoms. A. Electrons as Waves zLouis de Broglie (1924) yApplied wave-particle theory to e - ye - exhibit wave properties

Post on 02-Jan-2016

213 views

Category:

Documents

1 download

Embed Size (px)

TRANSCRIPT

  • Quantum Model of the Atom

    Electrons in Atoms

    C. Johannesson

  • A. Electrons as WavesLouis de Broglie (1924)Applied wave-particle theory to e-e- exhibit wave propertiesQUANTIZED WAVELENGTHS

  • A. Electrons as WavesQUANTIZED WAVELENGTHS

  • A. Electrons as WavesEVIDENCE: DIFFRACTION PATTERNS

  • B. Quantum MechanicsHeisenberg Uncertainty PrincipleImpossible to know both the velocity and position of an electron at the same time

  • B. Quantum MechanicsSchrdinger Wave Equation (1926)finite # of solutions quantized energy levelsdefines probability of finding an e-

  • B. Quantum MechanicsOrbital (electron cloud)Region in space where there is 90% probability of finding an e-

  • C. Quantum NumbersFour Quantum Numbers:Specify the address of each electron in an atom

  • C. Quantum Numbers1. Principal Quantum Number ( n )Energy levelSize of the orbitaln2 = # of orbitals in the energy level

  • C. Quantum Numbers2. Angular Momentum Quantum # ( l )Energy sublevelShape of the orbital

  • C. Quantum Numbersn=# of sublevels per leveln2=# of orbitals per levelSublevel sets: 1 s, 3 p, 5 d, 7 f

  • C. Quantum Numbers3. Magnetic Quantum Number ( ml )Orientation of orbitalSpecifies the exact orbital within each sublevel

  • C. Quantum Numberspxpypz

  • C. Quantum NumbersOrbitals combine to form a spherical shape.

  • C. Quantum Numbers4. Spin Quantum Number ( ms )Electron spin + or -An orbital can hold 2 electrons that spin in opposite directions.

  • C. Quantum Numbers1. Principal #2. Ang. Mom. #3. Magnetic #4. Spin #energy levelsublevel (s,p,d,f)orbitalelectronPauli Exclusion PrincipleNo two electrons in an atom can have the same 4 quantum numbers.Each e- has a unique address:

  • Feeling overwhelmed?Read Section 4-2!

    *

Recommended

View more >