1. Metals have one to three electrons in their outer shell, whereas non-metals have four to eight electrons.2. Metals are malleable, which means they can be beaten to thin sheets. On the other hand, non-metals are very brittle. 3. Metals have a high to moderate density, whereas non-metals have low to moderate density. 4. Metals are opaque and non-metals are transparent. 5. Metals are present in solid form at room temperature, and non-metals are present in solid and liquid forms at room temperature. 6. Unlike non-metals, metals are ductile, which means they can be stretched into wires. 7. Metals have a metallic luster, while non-metals do not. 8. Metals tend to lose their valence electrons, but non-metals share or gain valence electrons. 9. Metals are good conductors of electricity and heat, but non-metals are poor conductors.

The substance that has its sonority, lustrous ,ductility and malleablity is called metals .such as iron gold etc The substance that is non ductlie,non sonorous,non lustrous and brittle is called non metals .such as carbon etc