yes
yes
Magnesium oxide is an electrical insulator.
yes. magnesium oxide is a good conductor . It ionise to give magnesium and oxygen ions.
Magnesium chloride is not a good conductor of electricity in its solid form. However, when dissolved in water, it can conduct electricity because it dissociates into ions, which are able to carry electric charge.
Nitrogen is not a good electrical conductor.
Oh, dude, like, yeah, magnesium can totally conduct heat. It's like a little heat conductor party in there. So, if you need something to pass the heat around, magnesium's your guy. Just don't expect it to make you a cup of coffee while it's at it.
Conductor
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NO.
Yes, gold is a very good conductor
Carbon in the form of graphite is used as an electrical conductor (the brushes in electric motors)
Only when melted or dissolved in a polar solvent.