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Charge distribuvon of nacl solid state physics n

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Unformatted text preview: outer shell electron, they have a mutual electrostaVc agracVon on the order of: e2 ! 4"!0 r How close do they need to be to counteract the 1.3 eV required to bind? 1.1 nm apart So…why don’t they crash into one another? •  Coulomb agracVon is stronger as ions get closer, why don’t they crash into one another? •  This would merge the nuclei into Z=28 •  Pauli exclusion principle kicks in! Na: 1s22s22p63s Cl: 1s22s22p63s23p5 Z=28: 1s22s22p63s23p63d10 Must promote to 3p state once and 3d state 10 Vmes = 11 promoVons PotenVal energy for the ions vs R V(R) NaCl Pauli 1.1 nm R0=2.4 Å +  ­ 1.3 eV Difference b/w Na + Cl and Na and Cl R dissociaVon energy Pauli causes rapid increase in potenVal once the ions get close and wavefuncVons overlap. The energy to separate the two ions is called the dissociaVon energy. Charge distribuVon of NaCl Solid State Physics, N. Ashcrot and I. Mermin, Thomson Learning, 1976 Hydrogen bonding Hydrogen atom is essenVally a proton with a valence state and no inner core electrons H H H O O LibraVonal moVon of H ­bonded network H Hydrogen bond: sharing of proton b/w two electronegaVve ions (ex: water) Responsible for: icebergs floaVng! cross ­linking of huge bio ­molecules (DNA!) The peculiar behavior of water. van der Waals...
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