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Published byRhoda Whitehead Modified over 9 years ago
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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 (m s ) 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=0 1s 2 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 "1s 2 " 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 "1s 2 " means this is the s orbital belonging to the n=1 shell. n=1, l=0, m=0 1s 2, 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 m s values
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Electron Structure
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Diagonal fill rule ◦ s levels fill first, p next, d after p and f last of all
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Electron Structure Hund’s Rule
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Electron Structure Aufbau principle
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Electron Configuration & The Periodic Table
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Orbital Notation
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Longhand notation for Li: 1s 2 2s 1 Shorthand notation for Li: [He]2s 1 Be: [He]2s 2 B: [He]2s 2 2p 1 See table 4-5 p. 90 Hund’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/
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