200903 - Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley 1...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley 1 electron system: Hydrogen How about many-electron system? Z+ 1 electron with nuclear charge Z Increasing electrostatic interaction Orbital contract Orbital energy drops r Ze r V 2 ) ( = 2 2 6 . 13 n eV Z E n × = Example: For He + , Z=2, E 1 =-54.4 eV
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Chem 104A, UC, Berkeley For multi-electron atoms, Schrodinger equation can be set up, but can not be solved exactly. Use approximation. Build many-electron system: 1. 1. Pauli exclusion principle Pauli exclusion principle : No two electrons in an atom can have the same set of four quantum numbers (n, l, m l , m s ) m s : spin quantum number Quantized, +1/2 or –1/2 Each atomic orbital can contain at most two electrons. Chem 104A, UC, Berkeley Aufbau Aufbau principle principle : electron fill the atomic orbitals from the lowest energy up.
Background image of page 2
3 Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d…. . Example: Æ Li: 1,0,0, ½; 1,0,0,-1/2; 2,0,0, ½ Æ Al: 13 electrons 2 1 s 1 2 2 1 s s 1 2 1 2 6 2 2 3 3 ] [ 3 3 2 2 1 p s Ne p s p s s = Core electron Valence electron
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Chem 104A, UC, Berkeley Recall in Hydrogen: 2 2 2 4 2 2 2 2 n k h n e m r e E e n n = = = π Why are they different in multi electron system? E(2s)=E(2p) Electron-electron repulsion 2+ He = He + 1 e + First electron: 2 2 6 . 13 n eV Z E n × = Second electron?? Chem 104A, UC, Berkeley
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/28/2009 for the course CHEM 104a taught by Professor Staff during the Spring '08 term at University of California, Berkeley.

Page1 / 16

200903 - Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley 1...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online