[Mitch]

I remember hearing this before, that if all thing are equal the more covalent the bonding the more volatile that given species will be. Is this even true, or did I somehow pick up this dogma some where along my chemical career? If it is true, where can I find more information on it?

[Borek]

Sounds more or less logical (the more covalent boonding the weaker the dipole, the weaker the interactions - the more volatile compound). But no idea about where to look for details.

Besides, "all other things equal" is a dangerous assumption here - they can't be equal