What are outside the nucleus?
outside of the nucleus of an atom there are neutrons,protons and electrons.
An ion that has three more protons in the nucleus than there are electrons outside the nucleus will have a charge of?
The parts of the atom found outside the nucleus would be the electrons, or positrons if the nucleus of the atom is made of antimatter. The Heisenberg Uncertainty Principle shows us though that the electrons aren't found just in the space outside the nucleus, but in a probabilistic cloud, partly inside the nucleus.