A molecule came into being when two or more atoms interact chemically and combine together. Compound is also a molecule but it contains atom of minimum two or more elements. Generally all compounds can be considered as molecules but are molecules are not compound. A molecule can be most appropriately defined as a group of atoms tied in a definite arrangement.
Making the world better, one answer at a time. The electrons in a metal can leave the atom and move about in the metal as free electrons. While atoms in non-metals are bonded. Heat energy is passed along by vibartions as the bonds between the non-metals atoms are shaken.
Nonmetals are often thought of as being relatively poor conductors of heat; howevercrystalline nonmetals can actually have very high thermal conductivities. The thermal conductivity of sapphire (aluminum oxide) actually exceeds that of very pure copper (RRR 500), from about 20K to 100K.