The electromagnetic force is a long range force which acts of charged particles. Like charges repel and unlike charges attract.The colour force binds quarks together. It binds three quarks to make a baryon such as a proton or neutron. It binds two quarks to make a meson. The strong nuclear force is actually a residual effect of the colour force where quarks in a proton or neutron get bound to quarks in adjacent protons and neutrons. This effectively binds protons and neutrons to make a nucleus.The weak nuclear force is responsible for radioactive beta decay. It can convert a proton into a neutron, a positron and an electron neutrino. It can also convert a neutron into a proton, an electron and an electron antineutrino.The strong nuclear force is very short range and can only bind adjacent protons and neutrons. The electromagnetic force is long range. Thus every proton in a nucleus repels every other proton. This is which heavy elements are unstable.