More Details: Is there a spot with antimatter where the repulsive force of its nucleus and the attractive force of the positrons cancel out? As in if I took a heavy antimatter atom, ionized it, would there be a scenario in which electrons get attracted to the positrons around the anti-atom but cant get close enough due to the repulsive force from the nucleus, so it just sits around it unable to get closer but still attracted?
If you start with neutral antimatter atom, then you would have to add positrons in order to make it positively charged so that it would attract electrons. While it would be possible to then add electrons to an orbital, that electron would quickly find a positron and annihilate, leaving behind the original atom.
Matter-antimatter systems have been created in labs, the simplest being positronium, consisting of an electron and a positron orbiting each other. This "atom" lasts an average of 0.125 nanoseconds before annihilating into photons.