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It all depends on the material's small magnetic fields called domains. If a group of domains point one way and another group points the a different way, then the material is magnetic. If every single domain is pointing the same way then it is a magnet. If the domains are random then it is a nonmagnetic material.

Pure Iron is a material that will easily be lifted up by a magnet. This because of its structure, the bonds between the atoms. The magnet will attract all, due to a "weak" bonding. The atoms in the Iron will simply change charge so that they are attracted to a magnet regardless of North or South on the magnet..

When one mixes in other metals with Iron, say Chrome, the Chrome will cause the Iron atoms to be bonded very tightly to it. This mean that the Iron atoms can not any longer shift charges or turn in any way, and hence due to the "random" structure there will be (or at least can be) equally as many atoms that attracts to the magnet and push the magnet away. Then the material is non-magnetic.

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Q: Why do magnets only pick up some metals?
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