orbit to the atom of the following elements is impossible, and that the
th electron in the elements of higher atomic number will be bound in a new type of orbit. In this case, however, the orbits with which we meet will not be circular, as in the capture of the
th electron, but will be rotating eccentric orbits of the type
. This is very closely related to the fact, mentioned above, that the non-circular orbits will correspond to a firmer binding than the circular orbits having the same value for the principal quantum number, since the electrons will at certain moments penetrate much farther into the interior of the atom. Even though a
orbit will not penetrate into the innermost configuration of