An 'atomic nucleus'? Hm. Aren't they just sorta, well, lying around everywhere, for the taking? I mean, gosh, there's one, right over there (points). Maybe it was an Anna Nichole nucleus, and worth a bunch. But hey, who knew?
Btw, Mercury is breathtaking. Minimal cratering. Do you think the gravity from Ol' Sol might have saved it from a pounding?