Among nitrogen and argon, whose IP is greater?

They can't be compared. One is halogen,while the other is inert in nature. They completely differ in properties. read more

Argon, being a noble gas does not ionize. Hence it's ionization potential is greater than that of nitrogen. read more

Regarding inert gases, argon is completely inert, whereas nitrogen will react in extreme conditions. For instance, magnesium will burn in nitrogen, as will more reactive alkali & alkaline earth elements. Vacuum is quite different. There is no heat transfer by conduction or convection through a gaseous medium, so you would be relying on radiant heat. read more