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Drunkguy
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Halogen Colors
This might sound weird since in molecular modeling oxygen is red, nitrogen is blue, and hydrogen is often gray.
However, I want to know what the color of fluorine is.
I have read in text books at high enough concentration it is a pale blue.
Whenever people do computational chemistry it is often made to look similar to chlorine (ie greenish).
Does anybody have good quality photos of fluorine at high enough concentration (liquified if possible)?
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Drunkguy
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This one looks almost like lime: http://library.thinkquest.org/C0113863/Fluorine.shtml
Interestling since definately I had been getting it confused with the color skyblue.
See my attachment. Is that accurate or not?
[Edited on 6-8-2009 by Drunkguy]
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Ozonelabs
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Most of the Fluorine that can be seen online is Pale yellow.
We can show you liquefied Chlorine if that's of interest?
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UnintentionalChaos
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http://periodictable.com/Items/009.5/index.html
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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woelen
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The picture of Drunkguy seems to be fake to me. I believe it is chlorine gas, or maybe dilute chlorine dioxide. True fluorine apparently has a much
weaker color. That picture posted by UnintentionalChaos seems very brown to me, but other people also told me that a true fluorine sample has a
brownish appearance. Maybe it is yellowish/brown,. and the color rendering of the image posted by UnintentionalChaos is somewhat too brown?
EDIT: Fixed unfortunate offending typo
[Edited on 7-8-09 by woelen]
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Drunkguy
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Drunkgay? WTF
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Ozone
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I'm wondering if the pic from Drunkguy (ROTFLMAO--I am sure that was a typo!) might contain water (HF) and the color might be from the mix attacking
the glass (otherwise, it looks like chlorine)? The pic from UC looks orange or red to me, not inconsistent, perhaps with something like dilute Br. Is
this what perfectly dry pristine fluorine looks like under *deactivated* quartz?
Does the picture truly represent the model object?
Interesting,
O3
-Anyone who never made a mistake never tried anything new.
--Albert Einstein
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not_important
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| Quote: | | When examined in a thickness of one meter, it is seen to possess a greenish yellow color, but paler, and containing more of yellow, than that of
chlorine. In such a layer, fluorine does not present any absorption bands. |
http://chestofbooks.com/crafts/scientific-american/sup7/Phys...
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woelen
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My apologies, it was not my intent to upset you. This was an unfortunate typo  Probably this is because last week we had the gay parade in Amsterdam and we were
reading lots and lots about it.
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JohnWW
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As one goes from fluorine to astatine, the absorption band of the UV/visible spectra of the diatomic halogen molecules progressively increases in
wavelength and thus decreases in energy, this being also a function of the energy required to dissociate the molecules. This is why fluorine is pale
yellow (peak absorption being near the violet-UV boundary), chlorine is green, bromine is reddish-brown, and iodine is purple (peak absorption in the
middle of the visible spectrum). The colors of the univalent inter-halogen compounds, such as ClF, BrF, ICl, etc., would be intermediate between those
of the pure substances.
Has anyone ever seen a macroscopic quantity of astatine (At), at least in the vapor or liquid phase? - I would think it would probably be blue, due to
peak absorption probably in the red, but of course the intense radioactivity (and toxicity if ingested, like polonium) of all its isotopes
(longest-lived one has an half-life of only 8.3 hours) makes it hard to obtain (usually by bombarding Bi-209 with alpha particles) and view any
macroscopic quantity; do not try it at home.
[Edited on 7-8-09 by JohnWW]
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hodges
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Quote: Originally posted by JohnWW  | | Has anyone ever seen a macroscopic quantity of astatine (At), at least in the vapor or liquid phase? - I would think it would probably be blue, with
peak absorption probably in the red. |
Per CRC, the most stable isotope has a half-life of about 8 hours. It is considered the rarest of the elements because of this. Since it has to be
synthesized on demand through a nuclear reaction, probably few people in the world have seen macroscopic amounts.
Hodges
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pantone159
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I have this picture of liquid F2. (Condensed with LN2).
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woelen
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| Quote: Originally posted by hodges | | Quote: Originally posted by JohnWW | | Has anyone ever seen a macroscopic quantity of astatine (At), at least in the vapor or liquid phase? - I would think it would probably be blue, with
peak absorption probably in the red. |
Per CRC, the most stable isotope has a half-life of about 8 hours. It is considered the rarest of the elements because of this. Since it has to be
synthesized on demand through a nuclear reaction, probably few people in the world have seen macroscopic amounts.
Hodges
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Actually, very few people. I would say: nobody. A compound with a half-life of just 8 hours is so increadibly radioactive that no more than nanogram
quantities can be handled. If it really would be possible to see vapor or crystals of this element, then there would be pictures of that. But as far
as I know, there are no such pictures and I can understand why.
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pantone159
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| Quote: Originally posted by woelen | | Quote: Originally posted by hodges | | Quote: Originally posted by JohnWW | | Has anyone ever seen a macroscopic quantity of astatine (At), at least in the vapor or liquid phase? |
Actually, very few people. I would say: nobody. A compound with a half-life of just 8 hours is so increadibly radioactive that no more than nanogram
quantities can be handled. If it really would be possible to see vapor or crystals of this element, then there would be pictures of that. But as far
as I know, there are no such pictures and I can understand why. |
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I have tried to scour the net for photos of At (and any other elements where I can't collect a macroscopic physical sample!) and have never found
anything, I am not at all surprised for this reason.
OTOH - Does anybody know of any photos of Actinium? I think it has been seen, but I have never seen a picture of the element.
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12AX7
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The strange thing about nuclear materials is, few people ever see them. They are handled remotely, behind thick shielding. Reports of Cs137 chloride
(released in the Goana accident) seem surprised to tell of the volumetric blue glow, as though it had never been seen by western eyes before. Such a
shame.
Others, like actinium, don't have much use, so aren't produced in quantity.
It really is a shame. Every element needs a picture!
Tim
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Pyrovus
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Any intrinsic colour of the astatine would be vastly drowned out by the light released as a result of the radioactive decay - Astatine 210 releases
about 13000 kJ/mol/sec of energy through decay. As such, if a visible sample of astatine were prepared, I imagine it would look a lot like the surface
of the sun.
Never accept that which can be changed.
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not_important
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| Quote: Originally posted by pantone159 |
OTOH - Does anybody know of any photos of Actinium? I think it has been seen, but I have never seen a picture of the element.
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http://www.rsc.org/chemsoc/visualelements/PAGES/data/actiniu...
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12AX7
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I don't buy it. How big does that slug have to be? At least a few micrograms. Maybe as big as a grain of rice. Actinium is over a hundred times
more radioactive than radium, and a single gram of radium produces a huge blue halo. Even with bright lighting, I don't think that slug would look so
plain. Interesting that it's photographed on a blue background, though... that's just the thing to hide such a halo.
Tim
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bfesser
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That image looks computer generated.
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pantone159
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Interesting. I want to be skeptical as are others, although all the images I found similar to this looked legit.
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watson.fawkes
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| Quote: Originally posted by 12AX7 | | Even with bright lighting, I don't think that slug would look so plain. Interesting that it's photographed on a blue background, though... that's
just the thing to hide such a halo. |
It's entirely possible the photo was taken on a white background, in the
dark, through a telescope. I'm sure the actual story of how much government money was spent getting the photo is, at least, droll.
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Jdurg
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I'd be willing to put my entire life savings on the line betting that the photo is NOT of Actinium. The only place that I know of which may have
images of pure metallic Actinium would be the British Government. I believe they own virtually the entire world's supply of Actinium and have
photographed it many times, but those photographs are not released to the public.
(I know, I've tried. )
\"A real fart is beefy, has a density greater than or equal to the air surrounding it, consists of the unmistakable scent of broccoli, and usually
requires wiping afterwards.\"
http://maddox.xmission.com. |
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chloric1
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| Quote: Originally posted by Pyrovus | | Any intrinsic colour of the astatine would be vastly drowned out by the light released as a result of the radioactive decay - Astatine 210 releases
about 13000 kJ/mol/sec of energy through decay. As such, if a visible sample of astatine were prepared, I imagine it would look a lot like the surface
of the sun. |
If that is the case, then I wish I could see a concentrated solution of fuming hydroastinic acid. It would be like fuming liquid sunshine. 
Fellow molecular manipulator
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not_important
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| Quote: Originally posted by Jdurg | | I'd be willing to put my entire life savings on the line betting that the photo is NOT of Actinium. The only place that I know of which may have
images of pure metallic Actinium would be the British Government. I believe they own virtually the entire world's supply of Actinium and have
photographed it many times, but those photographs are not released to the public.... |
Well, the link I gave was to the site of the Royal Chemical Society, so you'll have to talk to them re the factual state of the image; it is
conceivable they might have better contacts with the British government than you.
However the Brits are not the only ones with actnium, see here for example
http://www.inl.gov/featurestories/2006-03-02.shtml
| Quote: | | INL Researchers have developed two separations processes that recover actinium-225 from nuclear waste, increasing world production by 75X, doubling
available source material, and enabling clinical cancer trials to proceed. |
And there is this http://www.ornl.gov/sci/nuclear_science_technology/nu_med/pr...
And there is another image of actinium out there, which does have a blue halo.
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unionised
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Are you, by any chance, looking at it on a computer?
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