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Electron configuration

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Electron configuration Electron configuration Short cut = Core notation Core notation takes the electron configuration of the last noble gas and adds the additional ... – PowerPoint PPT presentation

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Title: Electron configuration


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Electron configuration
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Electron configuration
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Element Atomic number Electron configuration
He 2 1s2
Ne 10 1s22s22p6
Ar 18 1s22s22p63s23p6
Kr 36 1s22s22p63s23p63d104s24p6
Xe 54 1s22s22p63s23p63d104s24p64d105s25p6
Rn 86 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p6
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Short cut Core notation
  • Core notation takes the electron configuration of
    the last noble gas and adds the additional
    electrons, in their perspective orbitals, to show
    the same electron configuration of the element

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Group 1 Group 6

O He2s22p4
S Ne3s23p4
Se Ar4s23d104p4
Te Kr5s24d105p4
Po Xe6s24f145d106p4
H 1S1
Li He2s1
Na Ne3s1
K Ar4s1
Rb Kr5s1
Cs Xe6s1
Fr Rn7s1
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Exceptions
  • Cr and Cu
  • Cr (d4) borrows 1 electron from s-orbital
  • Cr (Ar 4s1 3d5)
  • half filled d orbital is very stable
  • Cu fully filled d orbital
  • Cu (Ar 4s1 3d10)
  • filled d orbital is very stable

9
Electron configuration for ions
  • Negative ion add electrons to the last unfilled
    subshell
  • Positive ion -
  • electrons in outermost shell are removed first
  • Remove p before s before d- electrons

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  • Classwork p 156 158 27 - 29
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