What is the term for the smallest bit into which a chemical substance can be divided and still have
the properties of that substance?
a)electron
b)atom
c)molecules
d)iron

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