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Samenvatting H12; Lewisstructuren
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Uitleg van Lewisstructuren.
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12.2Bij lewisstructuren (LS) houd je rekening met de octetregel en het aantal valentie-elektronen.
Octetregel: edelgasconfiguratie: 8 valentie elektronen (4 e - paren)
Atoombinging: gemeenschappelijk e- paar
Alle overige valentie e- niet bindend: vrij e- paar.
Als het centraal atoom P, N of S is; is het aantal elektronen soms groter dan 8 -> uitgebreid octet.
LS opstellen:
1. Aantal valentie elektronen (BINAS)
2. Aantal elektronen totaal nodig om te voldoen
aan de octetregel
3. Tekort aan elektronen
4. Aantal bindende elektronenparen -> tekort
delen door andere atomen -> vorming van
gemeenschappelijke paren
5. Aantal niet bindende elektronenparen.
LS opstellen van een ion:
rekening houden met de lading:
Negatief: 1 of meer extra e- optellen bij
valentie e-
Positief: 1 of meer tekort aftrekken van
valentie e-
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