Atomic structure - semi-classical models

- first elements and inner shell electrons

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Hydrogen Z=1   1s

Helium  Z=2    (1s)2

Lithium Z=3    (1s)22s

Carbon Z=6    (1s)2(2s)2(2p)2

Boron Z=5    (1s)2(2s)22p

Beryllium Z=4    (1s)2(2s)2

 

As Z increases, electrons in inner shells get closer to nuclear core and hence binding energy increases  through the strength of the Coulomb interaction.  This leads to the element specific absorption edges and emission spectra.                                                                                                         © Peter Hammond 2004