Why do we have names for columns on the periodic table but not for rows

I need this ASAP

Decomposition is the cycle at which bacteria breaks down any organic material into the soil

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