Hi, I am a young physics student who wonders a lot about the atom, especially it's nucleus. I thought about the atom and realised that there could never be a nucleus of two protons because they both would reject each other. I have made some calculations and realised that the gravitational force is far lower than the electric force, so both protons would reject each other. Is there an element with only two protons in it's nucleus? or does it needs neutrons to bring the protons together? Thanks.