orbit will correspond to a stronger binding of this electron than a
orbit. On the other hand it follows from previous remarks that the binding will be much lighter than for the first
electrons which agrees that in chemical combinations scandium appears electropositively with three valencies.
If we proceed to the following elements, a still larger number of
orbits will occur in the normal state of these atoms, since the number of such electron orbits will depend upon the firmness of their binding compared to the firmness with which an electron is bound in a
orbit, in which type of orbit at least the last captured electron in the atom may be assumed to move. We therefore meet conditions which are essentially different from those which we have considered in connection with the previous periods, so that here we have to do with the successive development of one of the inner groups of electrons in the atom, in this case with groups of electrons in