How do the properties of silicon allow its use

The chemical bubbles

Noble gases is far right

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Its not chemical its not radiation and its not convection because there is not movement of fluids so it is thermal conduction