| Element Combination | Bonding Type | Likely Structure |
| Nonmetal and nonmetal | Covalent molecular Covalent network |
Discrete molecule: CO2, PCl3, NO Extended solid (network): C, SiO2 |
| Metal and metal | Metallic | Extended solid (alloys): CuZn (brass), NiTi |
| Metal and nonmetal | Ionic | Extended solid (salts): NaCl, ZnS, CaF2 |