Table 604 497 



ENERGY OF BINDING OF AN ELECTRON— NEUTRAL ATOMS 



(Adapted from paper by Henry Norris Russell, Astrophys. Journ., 70, 1929.) 



The electrons in an atom, neutral or ionized, are bound in different states (a preferable 

 term to "orbits"). The more firmly bound inner ones which form parts of the completed 

 shells concern the spectroscopy of X rays but not of ordinary light. The two following tables 

 give a study of the energy of binding of an electron, in different atoms, in the same state, 

 the state characterized by the same total and azimuthal quantum numbers, denoted in 

 Bohr's notation by ii, 2 U 31, — ; 2 2 , 32, 42, — ; 33, 43, — ; 4*,, — , or more commonly at present, 

 is, 2s, 3s, — ; 2p, 3p, 4p, — ; 3d, 4c!, — ; 4f, — -. The energy in volts is given required to remove 

 an electron in the given state from the atom or liberated when it returns. Among the energy 

 levels resulting from different space quantizations of the same electronic configuration, that 

 with the greatest binding energy is given regardless of the multiplicity. Most values are 

 derived from spectrum series and are fully reliable; those in ( ), two decimals, are extra- 

 polations from series formulae and should be substantially correct; those in ( ), one deci- 

 mal and in [ ] are interpolated and should be accurate to o, to 0.2 v. 



Smithsonian Tabues 



