electron structure the quantum number the electron’s “hood”
TRANSCRIPT
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Electron Structure
• The Quantum Number• The electron’s “hood”
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Electron Structure• The Quantum Number• The electron’s “hood”• 3 dimensional address
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Electron Structure• The Quantum Number• Attraction versus repulsion determines
region, shape of region and spin of electron• No electron can have the same 4 quantum
numbers (Pauli Exclusion Principle)
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Electron Structure• The Quantum Number• Principal energy level (n)• 2 dimensional representation
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Electron Structure• The Quantum Number• Principal energy level (n)• Real pattern far different- both wave and
particle
• L number (azimuthal) – shape and orbital
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Electron Structure• The Quantum Number• Magnetic or m number• Spatial orientation of the orbital within
atom• Starts with negative of l and goes to
positive• E.g. l=2, m=-2,-1,0,1,2
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Electron Structure• The Quantum Number• Electron-spin quantum number • AKA magnetic (ms) number
• Illustration – Helium (He) atom• Two electrons in one cloud• Opposite “spin” or magnetic qualities• + ½ (Arrow up) or -1/2 (arrow down)
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Electron Structure The Quantum Number n=1, l=0,
m=01s2
s=+½,-½
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Electron Structure This is the helium atom. It has 2 electrons. These are
able to share the same s orbital because of opposite spins. The "2" in "1s2" means there are 2 electrons in that orbital. "s" orbitals can only hold 2 electrons, so that's as high as you will ever see it. The 1 in "1s2" means this is the s orbital belonging to the n=1 shell. n=1, l=0, m=0
1s2, s=+½ , -½
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Electron Structure
• Pauli Exclusion Principle•Each orbital can contain only one electron with each kind of spin• If two electrons are in an orbital they must have different ms values
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Electron Structure
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Electron StructureDiagonal fill rule
◦s levels fill first, p next , d after p and f last of all
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Electron StructureHund’s Rule
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Electron Configuration & The Periodic Table
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Orbital Notation
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Orbital Notation
Longhand notation for Li: 1s2 2s1
Shorthand notation for Li: [He]2s1
Be: [He]2s2 B: [He]2s22p1
See table 4-5 p. 90Hund’s rule example: C
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Atomic Number & Mass
Atomic Mass = sum of mass of protons + mass of
neutrons
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Atomic Number & Mass
http://jefflittle.edu.glogster.com/the-periodic-table/
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The Periodic Table
http://jefflittle.edu.glogster.com/the-periodic-table/