They are ductile meaning that they can be drawn into thin sheets or wires without breaking. They are good conductors of heat and electricity. There are 17 nonmetals in the periodic table, and they are characterized by four major physical properties. They rarely have metallic luster. They are usually gases at room temperature.
Nonmetallic solids are neither malleable nor ductile.
They are poor conductors of heat and electricity. Ge, As, Sb, and Te. The properties of the metalloids have characteristics in between that of the metals and the nonmetals. They are good conductors of heat and electricity, but they are not good conductors or insulators. The periodic table also has certain properties characteristic of certain regions in the periodic table.