What ion does xenon form?

Although Xenon itself does not form any ions normally, being a Member of the Noble Gases (Group 8), it can be compounded with other nonmetals in a covalent bond to form polyatomic ions. The most common form of these usually consists of Xenon and a Halogen (more often Fluorine) or Oxygen, however others exists. An example is Tetraxenonogold II (AuXe4+2).