Q:

Can metal or carbon vapour conduct electricity?

Not a duplicate of Can Gases conduct Electricity, since it asks about ionised gases, which is irrelevant to my question.

This is what I already know:

All metals have a giant metal lattice, where atoms are positive ions in a ‘sea’ of delocalised electrons, since they lose their outer (valency) electrons. The metal conducts electricity because the delocalised electrons can move throughout the structure when a voltage is applied.
Carbon is the only non-metal that conducts electricity, when it is graphite, and it conducts for a similar reason that metals do.
Only 3 out of 4 outer (valency) electrons are used in forming covalent bonds, and all of the atoms’ 4th electrons are free to move along the layers when a voltage is applied, carrying the current. (Current can only be carried along the layers, not throughout the structure like a metal)

I also know that metals still conduct electricity when liquid, but liquid carbon does not.
My question is this:

Can metal vapour conduct electricity?
Can carbon vapour conduct electricity ?

A:

Metal vapors are insulators but at high density mercury vapor exhibits a metal non-metal transition: https://journals.aps.org/rmp/abstract/10.1103/RevModPhys.40.697 

