PLS HELP DECODE THIS The number of protons and neutrons are used to determine the:
(C1) T (H4) M (A1) C (H2) A (F4) S

Protons and neutrons determine the ATOMIC MASS

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   

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