Its uses for the
bleaching of wool, cotton, silk and other textile fibres and for the decolourisation
of oils are also dependent on its strong oxidising power THE INNER TRANSITION ELEMENTS ( f-BLOCK)
The f-block consists of the two series, lanthanoids (the fourteen elements
following lanthanum) and actinoids (the fourteen elements following
actinium) Because lanthanum closely resembles the lanthanoids, it is
usually included in any discussion of the lanthanoids for which the
general symbol Ln is often used Similarly, a discussion of the actinoids
includes actinium besides the fourteen elements constituting the series