In general they are poor conductors of heat and electricity. They tend to be Brittle - if a solid. They are usually Non-ductile unlike metals which are. They tend not to be lustrous May be Solids, liquids or gases at room temperature.
Brittle is neither a metal or nonmetal, it is a physical property of materials.Brittle is a property of a material. Most metals are not brittle but ductile and maleable.
Colourless is a property, or word to describe matter, however the "gas" would be something you're describing. However, if a reaction is omitting a colourless gas, it could be considered a physical property of the reaction.
no
physical property
synthetic
No, physical property is NOT a physical property itself
Dubnium is a transition metal. As it is highly radioactive, not much is known about its physical or chemical properties.
A physical property.
Appearance is a physical property.
Harb
physical property
metal -->nonmetal --> gaseous (metal --> nonmetal --> metalloid)