orbits respectively, but fully as much to the possibility of bringing the orbits inside these subgroups into harmonic relation with one another. The situation is different, however, for the groups of electrons with
-quanta orbits. Three subgroups of four orbits each cannot in this case be expected to come into interaction with one another in a correspondingly simple manner. On the contrary we must assume that the presence of electrons in
orbits will diminish the harmony of the orbits within the first two
-quanta subgroups, at any rate when a point is reached where the
th electron is no longer, as was the case with scandium, bound considerably more lightly than the previously bound electrons in