Metallic: found in metal elements, positive ions in sea of delocalised electrons, conduct as solid or liquid, Covalent non-polar: between non-metals with close electronegativity, contain very weak forces between molecules, found in elements or compounds, do not conduct, Covalent polar: found between elements with middle difference in electronegativity, molecules contain a dipole, do not usually conduct, contain forces between molecules, Ionic: found between elements with big difference in electronegativity, conduct as liquid or solution, lattice structure,

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