Draw arrows for all of the attractive and repulsive forces between the negatively charged electrons and
positively charged protons in these atoms. Make sure your arrows
clearly show the difference between attractive and repulsive forces.
Note that the particles without a charge label are neutral.

Idid the calculation and i get 875,000,000 which can be written as 8.75 x 10^6?

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