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Atomaire bindingen

Atomaire bindingen. - ionische binding - covalente binding - metallische binding. Ionic bonding 1. between a Li atom and a F atom. E. Ionic bonding 2. gives Li + F - molecule. Electron Affinity (EA). Ionization Potential (IP). E. Energy cost: D E = IP(Li) – EA(F).

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Atomaire bindingen

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  1. Atomaire bindingen - ionische binding - covalente binding - metallische binding

  2. Ionic bonding 1 between a Li atom and a F atom E

  3. Ionic bonding 2 gives Li+F- molecule Electron Affinity (EA) Ionization Potential (IP) E Energy cost: DE = IP(Li) – EA(F)

  4. Ionic bonding 3 Ionic binding curve: electron transfer Pauli repulsion Coulomb attraction ions Binding curve has stable minimum !!

  5. Ionic bonding 4 only works between very dissimilar atoms !!

  6. Ionic bonding in solids common salts have ionic bonding NaCl structure CsCl structure Cs+ Na+ Cl- Cl- structure determined by relative size ions

  7. wells close ES<EA electron wants to pull wells close !! Covalent bonding 1 Model system: one electron in two wells wells far apart

  8. Covalent bonding 2 H2 molecule: two electrons in two wells E H atom H2 molecule H atom allowed by Pauli

  9. Covalent bonding 3 He2 molecule? four electrons E He atom He2 molecule He atom • no electronic bonding in He2 • no stable He2 molecule !! • because of Pauli exclusion principle

  10. Hetero-atomic covalent bonding HF molecule H atom F atom E polar bond !!

  11. Poly-atomic covalent bonding 1 H2O molecule 2 2 covalent bonding gives directional bonds !!

  12. Poly-atomic covalent bonding 2 CH4 molecule: tetraeder C hybrid orbital

  13. Covalent bonding in solids C, Si, ... have covalent bonding and compound semiconductors: GaAs, ... diamond structure

  14. Metallic bonding in solids 1 metal: one electron in many wells positive ions has a wave-like character (delocalized)

  15. 'Fermiology'

  16. Twee verschillende metalen met elkaar in contact  contact-potentiaal

  17. Volgende (laatste) hoor-college: Quantum theorie van electrische geleiding Isolatoren vs. (half)geleiders, supergeleiders Terugblik op de gehele stof

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