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Warm Up 9/20. Draw the Bohr Model for Aluminum What is the difference between a hypothesis and a theory?. The Quantum Mechanical Model. Chemistry. Bohr’s Model. Bohr energized hydrogen electrons (1 e - per atom) Energized electrons jumped certain distances from the nucleus.

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warm up 9 20
Warm Up 9/20
  • Draw the Bohr Model for Aluminum
  • What is the difference between a hypothesis and a theory?
bohr s model
Bohr’s Model
  • Bohr energized hydrogen electrons

(1 e- per atom)

  • Energized electrons jumped certain distances from the nucleus
bohr s model1
Bohr’s Model
  • Bohr saw 4 colors
  • Each color has a specific wavelength
bohr s model2
Bohr’s Model
  • Each wavelength corresponds to a distance from the nucleus
  • These distances are called “shells” or “energy levels”
bohr was wrong
Bohr was wrong
  • While Bohr’s theory worked for hydrogen, it could not be applied to any other element because they all have more than one electron
werner heisenberg
Werner Heisenberg
  • 1927, Germany
  • Heisenberg Uncertainty Principle = It is impossible to determine simultaneously both position and velocity off an electron or any other particle
heisenberg s uncertainty principle
Heisenberg’s Uncertainty Principle
  • It’s impossible to determine where any one electron is at any point in time.
  • Scientists talk about probabilities of electrons locations (electronic cloud).
erwin schr dinger
Erwin Schrödinger
  • Physicist from Austria
  • Late 1920’s
  • Wrote an equation to describe the probable location of an electron
quantum mechanical model
Quantum Mechanical Model
  • Current Electron Theory
  • Created by Schrödinger
  • Involves Quantum Numbers
  • Can be shown using Electron Configurations (ex: 1s22s22p5)
quantum numbers
Quantum Numbers
  • Each electron is located in an energy level (n), which is within a sub-level with a shape (l).
quantum numbers1
Quantum Numbers
  • A sub-level is made of orbitals. Different electrons within the same sub-level will have a different orientation (ml) depending on the orbitals orientation within the sub-level.
  • Each orbital can have 2 electrons max, but they have opposite spin (ms)
quantum mechanical model1
Quantum Mechanical Model
  • Electrons are arranged into Energy Levels or Shells (1, 2, 3, 4, …).
  • The “Principal Quantum Number” (symbolized by n) indicates the main energy level occupied by the electron
quantum mechanical model2
Quantum Mechanical Model
  • Energy Levels contain sub-levels (s, p, d, f)
  • The “Azimuthal or Angular Momentum Quantum Number” (symbolized by l) indicates the shape of the sub-level
nrg sub level s azimuthal quantum number 0
NRG Sub-level “s”Azimuthal Quantum Number 0

“s” sub-level

  • l = 0
  • Sphere shape
  • Contains 2 e-
  • One Orbital
nrg sub level p azimuthal quantum number 1
NRG Sub-level “p”Azimuthal Quantum Number 1

“p” sub-level

l = 1

Contains maximum 6 e-

3 orbitals

nrg sub level d azimuthal quantum number 2
NRG Sub-level “d”Azimuthal Quantum Number 2

“d” sub-level

l = 2

Maximum 10 e-

5 orbitals

nrg sub level f azimuthal quantum number 3
NRG Sub-level “f”Azimuthal Quantum Number 3

“f” sub-level

l= 3

Maximum 14 e-

7 orbitals

quantum numbers2
Quantum Numbers
  • Magnetic Quantum Number (ml) indicates the orientation of an orbital around the nucleus
  • For example, the sub-level “p” is composed of 3 different orbitals (px, py, and pz)
  • Scientists use the values -1, 0, and +1 to tell the orbitals apart.
practice with magnetic quantum numbers
Practice with Magnetic Quantum Numbers
  • What would be the magnetic quantum number used for the s sub-level?
  • What would be the magnetic quantum numbers used for the d sub-level?
spin quantum number m s
Spin Quantum Number,ms
  • A maximum of 2 electrons can fit into each orbital. BUT electrons don’t like each other (repel)
  • 2 spins = +1/2 (up) and -1/2 (down)