th electron in the atom. Here we meet conditions which in some respects are analogous to those connected with the binding of the
th electron. The same type of argument that applied to the carbon atom shows that the symmetry of the configuration in the neon atom would be essentially, if not entirely, destroyed by the addition of another electron in an orbit of the same type as that in which the last captured electrons were bound. Just as in the case of the
rd and
th electrons we may therefore expect to meet a new type of orbit for the
th electron in the atom, and the orbits which present themselves this time are the
