498 



Table 605 

 ENERGY OF BINDING OF AN ELECTRON— SINGLY IONIZED ATOMS 



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



This table companions the preceding one. A number of entries have been derived in 

 various ways and may be in error by .5 volt; Li +, 3-4 v. The lines of a diagram made 

 from the data of these two tables, with atomic numbers as abscissae and energy of binding 

 as ordinates, a separate line for each state, are strikingly similar. The familiar "displace- 

 ment law" applies not only to the multiplicities present in the spectrum, but also to the 

 energy relations — the spark spectrum for any element resembling in both respects that of 

 the arc of the preceding element. 



The energy of binding, for a given state, increases with the atomic number. For the s 

 states the increase is steady; for the p and d states it is interrupted by fluctuations remark- 

 ably similar. 



The increase of energy is most rapid (1) when electrons of a given type are building up a 

 complete shell; (2) when s electrons are being added. The fluctuations are most conspicuous 

 when a shell is half full (half of the 6p electrons in N, P, As, + , S + , and of the iod electrons 

 in Cr, Mn+). 



Energy of Binding of an Electron — Singly Ionized Atoms 



Smithsonian Tables 



