Metals have a crystalline structure, whereas non-metals possess amorphic structure.
At room temperature, metals are usually solid, except mercury and gallium which are in the liquid state. Conversely, non-metals can be found in solid or gaseous form, except Bromine which is the only non-metal that is present in liquid form.
Density is the ratio of mass to volume; metals have a higher density as compared to non-metals.
Metals look smooth and shiny, while non-metals usually appear dull.
When it comes to hardness, metals are generally hard substance, but it varies from substance to substance. Unlike non-metals is soft substance except diamond, which is the hardest substance on earth.
CHEMICAL PROPERTIES:
Metals support conduction of heat and electricity. Conversely, non-metals are insulators, and so they do not support conduction of heat and electricity.
Metals have a very high melting and boiling point. In contrast, non-metals are boiled and melted at a relatively low temperature.
In the outer shell, metals consist of 1 to 3 electrons, whereas non-metals consist of 4 to 8 electrons.
