# Why are the protons in the nucleus not repelled by each other? [duplicate]

• What's particularly interesting is that the electrical repulsion between two protons only barely exceeds the attractive (residual) strong nuclear force between them. If the strong nuclear force were a few percent (~2 to 6%) stronger relative to the electromagnetic force, two protons would spontaneously bind to form the diproton, a stable isotope of helium ($\ce{^2_2 He}$). This would have massively altered the course of the evolution of the Universe (completely different big bang and stellar nucleosynthesis). Chemistry could be virtually non-existent! – Nicolau Saker Neto Jan 5 at 9:53