What are three ways in which a metal is different to a non-metal?

Metals are good conductors of energy and heat while non metals are bad conductors of energy and heat

Metals are malleable and ductile while nonmetals are brittle

Metals are solid at room temp expect Hg which is liquid at room temp and we have non metals that’s are solid liquid and gas such as ( carbon oxygen sulfur bromine iodine )

Outermost (valence) electrons