Maximum ionization of free elements

[xortdsc]

Hi,

I wondered what is the maximal ionization of a given element when it is free (not bound into a molecule).
I'd assume it is possible to strip off all electrons of a given element (given sufficient ionizing radiation) so the maximal positive charge should be +Z (Z being the atomic number).

While the cation ionization seems straightforward I'm more concerned about the anion ionization. How many additional electrons can be captured by an (isolated) element ? None ? Up to the next noble gas ? Or only filling up subshells which already have a single electron in it ?
Can someone shed light on how that is and why ?

Thanks and cheers.

 

[voko]

See http://arxiv.org/pdf/1009.2367.pdf

 

[xortdsc]

See http://arxiv.org/pdf/1009.2367.pdf

cool. thanks a lot :)