Steel alloys are mostly iron. Vehicles, machines, and buildings are made of steel. Iron can be used in magnets. Iron makes blood red. Cobalt steel is strong and can be used in magnets.
Nickel steel is strong and can be used in magnets.
Copper conducts electricity well and is used in electric wires. Copper and gold are the only colored metals. Most colored alloys, such as brass and bronze, contain copper. Zinc and copper make brass. Germanium is used in electronic devices, such as transistors.