Bohr Theory
Characteristic x-ray spectrum identifies elements
depends on Z which determines the chemical properties
K-shell electrons are close to nucleus
visible spectrum involves transitions of outer electrons
Bohr theory works for hydrogen but not multi-electron atoms
however it works well for the Moseley plot
consider an L-electron (n=2 level) about to make a transition to the K-shell which now only has one electron left
L electron “sees” a net charge of Ze + (-e) = (Z-1)e
more precise calculations find (Z-b)e where b~1
Bohr theory for a transition ?E between n=2 and n=1 levels