Grade 7 DA#2 A group of scientists is developing a small, working model of a solar-powered heating and cooling system. What is the purpose of building this model?

What does that mean you dum bum

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   

In any atom of any element, you will find protons and neutrons in the nucleus of any atom