Give the number of atoms in the molecule of the gases among the elements mentioned below Na, Mg, Al, Si, P, S, Cl and Ar

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   

Isec i will do it and them i will let you know