- A magnet attracts magnetic metals / ferromagnetic metals through magnetism
- A paper clip is often made of magnetic metals
- So, a magnet can attract a paper clip

- A magnet can attract a paper clip
- An unknown object can attract a paper clip
- Therefore, an unknown object and a magnet can both attract a paper clip

- An unknown object and a magnet can both attract a paper clip
- The ability to attract a paper clip is a kind of property
- So, the unknown object has the same property as a magnet

- The unknown object has the same property as a magnet
- A magnet is magnetic
- Therefore, the unknown object is magnetic

Therefore, the unknown object is magnetic
Which object would best help a student determine if a block of an unknown material is magnetic?
- A magnet is magnetic 
- A magnet attracts magnetic metals / ferromagnetic metals through magnetism 
- A paper clip is often made of magnetic metals 
- An unknown object can attract a paper clip 
- The ability to attract a paper clip is a kind of property