[Jules18]

These are the solubility rules I've been going by:
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html

They're pretty basic, so I'm not really sure about other elements or compounds, like these:

Cu                   
Zn   <-- are metals by themselves always insoluble?
Pb
Hg

CuO   <-- and this is one of those compounds that my basic rules don't really cover.

Can anyone tell me whether those would be soluble or not?  Thank you ^^