Nonmetals are (usually) poor conductors of heat and electricity, and are not malleable or ductile; many of the elemental nonmetals are gases at room temperature, while others are liquids and others are solids.

Why are non metals not malleable?

Non - metals are non - malleable. Because non - metals are brittle, they break into pieces on being harmed. Hope it helps.

Which non metal is non malleable?

Malleability

For example, sulphur and phosphorus are solid non-metals which are not malleable, they cannot be beaten into thin sheets with a hammer.