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Quantum Numbers and Electronic Configuration

Quantum Numbers and Electronic Configuration. http://www.aip.org/history/heisenberg/p08.htm. Heisenberg’s Uncertainty Principle(1901-1976). The principle states that it is impossible to know the exact position and momentum of an electron.

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Quantum Numbers and Electronic Configuration

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  1. Quantum Numbers and Electronic Configuration http://www.aip.org/history/heisenberg/p08.htm

  2. Heisenberg’s Uncertainty Principle(1901-1976) • The principle states that it is impossible to know the exact position and momentum of an electron.

  3. How do I know how the electrons are distributed around Si ?

  4. QUANTUM NUMBERS • The shape, size, and energy of each orbital is a function of 4 quantum numbers which describe the location of an electron within an atom or ion n ---> energy level l ---> sublevel ,shape of orbital ml ---> designates the rotation of the orbital s ---> spin of the electron (clockwise or counterclockwise:

  5. 1. Principal quantum number (n) Describes the energy level where the e- can be found.

  6. 2. Angular Quantum Number(l) • The orbitals, associated with each energy, determine where the electrons are located. This quantum number can take on the values: l=0 (s-orbital) l=1 (p-orbital) l=2 (d-orbital) l=3 (f-orbital)

  7. 3.Magnetic Quantum Number ml • Magnetic quantum numbers give the 3D orientation of each orbital.

  8. 4. Spin quantum number Describes the spin of the electron.

  9. Electron Configuration Electron configuration is a shorthand notation for describing the arrangement of the electrons about the nucleus. General format using the quantum numbers: n l e- n = principle quantum number l = orbital quantum number e- = number of electrons

  10. Hydrogen: 1s 1

  11. Examples Electronic Configuration: C 1s22s22p2 2, 4 Si How do we know how many electrons are in each level?

  12. Electronic Configuration simulation http://chemmovies.unl.edu/ChemAnime/ECONFIG/ECONFIG.html

  13. Periodic Table and electronic configuration

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