Which metals are magnetic?

Students are testing which metal items are magnetic.  We are beginning a magnet unit and are discovering that coins, a necklace, aluminum foil, a pop can, some matchbox cars, and some jewelry are NOT magnetic.  Many of our metal items were magnetic:  a wire, a heavy can, a photo button, a battery, an egg dipper, paper clips, a screw, a washer, a nail, and a crown.  We will be testing magnet strength next.