A "vapor" in chemistry is always the gas phase of a substance that is more familiar in one of its condensed phases: liquid or solid. Therefore, iodine vapor is the gas phase of the element iodine, and has the same molecular composition as the solid, I2. Iodine is a solid at standard temperature and pressure, but sublimes directly to gas phase, without any intermediate liquid phase, at only moderately higher temperatures than the standard.
It is iodine in its gas state which. It enters this state when you heat it.
because the molecules of iodine absorbs red and violet radiations and then emit them
Iodine and ammonium salts sublime, their vapours then turn back into solids when cooled down. To see the sublimation, heat some iodine in a china dish and place a funnel upside down above the vapours (violet). The heated vapours become solid on contact with the funnel wall.
The substance you are describing is likely iodine. Iodine is a dark grey solid that can sublime directly from a solid to a vapor without going through the liquid state. When iodine sublimes, it forms a violet vapor.
The state of vapour is gaseous.
Iodine ion is not consumed; in the first step the iodine ion is oxidized to iodine, in the second step iodine is reduced to iodine ion.
Iodine is not a metal.
no
Whi many are, many are not (iodine vapour is quite easily seen, for example, where water vapour is not).
heat the mixture iodine will sublime collect the iodine vapour separately and cool
Iodine
Iodine.
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pi* to sigma* transition
Iodine crystals
Purple vapour appearing = physical
It is vapour formed during the process of sublimation.
Chlorine is Green gas Bromine is brown/red liquid , with a brown red vapour Iodine is a black solid, with ?? purple??? vapour.
I expect you mean iodine vapour. Please see the link.