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anisfekry

  • 3 years ago

how to determine the elements that are expanded octet and incomplete octet?

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  1. pieprz
    • 3 years ago
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    do you mean in general or from a lewis diagram or...

  2. anisfekry
    • 3 years ago
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    for the lewis diagam

  3. pieprz
    • 3 years ago
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    ok, well first you know what the octet rule is right?

  4. anisfekry
    • 3 years ago
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    yea..I understand that one

  5. pieprz
    • 3 years ago
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    elements of period 3 and above can expand their valence shells to include extra lone pairs or bonded pairs

  6. pieprz
    • 3 years ago
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    but incomplete octet - in your course or book, do they mean the other exceptions to the octet rule (there aren't enough valence elctrons or there are odd numbers)?

  7. pieprz
    • 3 years ago
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    in any case, you can always count the number of valence electrons and bond pairs and see if anything is different than it should be

  8. pieprz
    • 3 years ago
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    too little = incomplete (many things with Al, Be, B) and "free radicals" to many = expanded (ICl4, phosphorus (PCl5)

  9. pieprz
    • 3 years ago
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    i have to go, maybe this would help http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Exceptions-to-the-Octet-Rule-573.html good luck

  10. anisfekry
    • 3 years ago
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    oh...thank you!

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