Which is the element with the highest electronegativity value?
a)cesium
b)helium
c)calcium
d) fluorine

Fluorine not helium if you do research youll see why

The highest electronegativity value is fluorine

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