ABSTRACT
This chapter investigates that the magnetic properties of the elements become those of the atom and the molecule, and in studying atomic structure magnetism come more into prominence as atomic phenomena. Iron, cobalt and nickel have a high susceptibility which passes through a wide range of magnitude as compared with all other elements, k being particularly variable in highly magnetic metals, such as iron. The susceptibility is also a ratio, like the permeability, being the ratio of the intensity of the induced magnetism to the magnetising force; the relation may be expressed thus I/H=k. In the phenomenon of magnetic susceptibility it may be conducive to clearness to note that the term ferromagnetic, as applied to iron, cobalt and nickel, serves to distinguish these elements or substances from practically all others which are feebly magnetic or which do not exhibit certain magnetic properties peculiar to iron.
