A tri-cation of an element has 45 electrons. Approximately how many neutrons does this element have (round to nearest integer, i. e. no decimal places, you do not have to take into account isotopes).

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   

It must be measured in k.hope my answer is to you : )