Atoms

I've heard from many people that scientists have still not been able to determine what holds atoms together on the molecular level. I'm not sure if this is already a topic in discussion or not. If anyone knows any info on this topic let me know.

OK sorry I havent responded sooner but my question seemed unclear to me after i read it but what i really wanted to know is what is holding molecules together. like if I look at my arm at the skin cells, What is holding them together? The molecules to each other i mean. I read that some people said that it was electric charges or something but that doesnt seem strong enough to hold my skin together say i just barely bump into something. Anyone want to help clear this up for me thatd be great. Just looking for an answer. Basically I want to know whats keeping the molecules in our body from just separating and floating off.