Write a hypothesis for the following problem. A man bought a chain for his cow and noticed a year later that only one link in the chain did not rust.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

The best answer is the third option, a pottery art studio.