How do I identify methyl groups from pictures, Are all the ch3 groups in these pictures methyl or is there some kind of rule to classify them?

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   

Ametal with a large number of free flowing electrons most likely has good conductivity

Ijust took the quiz. their is no coefficient needed. : )