Electronic configuration

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  • 1. ELECTRONIC CONFIGURATION
  • 2. ELECTRONIC CONFIGURATION
    -arrangement of electrons in the space around the nucleus of an atom.
    -distribution of electrons in the orbitals of an atom.
  • 3. ELECTRONIC CONFIGURATION
    ENERGY LEVEL (electron shell)
    -orbit where electrons spin around the nucleus of an atom.
  • 4. ELECTRONIC CONFIGURATION
  • 5. ELECTRONIC CONFIGURATION
    ENERGY SUBLEVEL (subshell)
    -energy subdivision of a principal energy level.
    -designated by:
    s(sharp)
    p (principal)
    d (diffuse)
    f (fundamental)
  • 6. Mnemonic Device for Electronic Configuration
  • 7. Electronic configuration of:
    IodineI53
    = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5
  • 8. Electronic configuration of:
    Silicon Si14
    = 1s2 2s2 2p6 3s2 3p2
    LeadPb82
    = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p2
  • 9. RULES
    AND
    CONCEPTS
  • 10. AUFBAU’S PRINCIPLE
    -”aufbau” –building up
    -principle of electrons filling up the orbitals in order of increasing energy.
  • 11. PAULI’S EXCLUSION PRINCIPLE
    -an orbital may be occupied by a maximum of two (2) electrons.
    -the maximum number of electrons in each of the sublevels and orbitals:
  • 12.
  • 13. HUND’S RULE
    -if electrons have more than one equivalent orbital available, they will half-fill each of the equivalent orbitals before filling the second half of each.
  • 14. Example: Electronic configuration of: 14N = 1s2 2s2 2p37
  • 15. Electronic configuration of:56Fe= 1s22s2 2p6 3s2 3p6 4s2 3d 626