 An unusual ion containing xenon is the tetraxenonogold ( II ) cation , AuXe2 + 
 An unusual ion containing xenon <a href='drop_aux' title='1'><mark>is</mark></a>the tetraxenonogold ( II ) cation , AuXe2 + 
An unusual ion containing xenon da tetraxenonogold ( II ) cation , AuXe2 +