How to Form Neutral Particles?

The no arrangement of protons and electrons will give you a neutral object. If they are rational fraction of each other, if the proton is like 5 fourths or 9 eighths then yeah, you could have a certain relationship. But even this is relying on an assumption, right? It's an assuming that you could still build something neutral so that gravity could take over. Like maybe I wonder if biology or nature needs neutral particles.