silicide: any of various compounds of silicon with a more electropositive element or radical
compound: (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
rutherford atom: first modern concept of atomic structure; all of the positive charge and most of the mass of the atom are contained in a compact nucleus; a number of electrons (equal to the atomic number) occupy the rest of the volume of the atom and neutralize the positive charge