Reacting Fluorine with Caesium – First Time on Camera


So I’ve come up to the
University of Leicester, and I’ve brought with me a tube
here containing Caesium. Caesium is found in the
far corner here. And it is the most reactive
metal in the entire periodic table Even more reactive
than Francium. This is a radioactive element
and it decays. But actually, Caesium is more
reactive than this. It’s the most reactive
thing we can find. Now, why have I come
up to Leicester? I brought this because I want to
see how it reacts with the most reactive, non-metal in
the entire periodic table. And that’s the element
Fluorine. And we don’t think this has
ever been shown before, so we’re not entirely sure
how it’s going to go. So I’m gonna go and see. Having decided that I wanted to
do this crazy reaction, I needed to find just the right
person to handle the Fluorine. And this is Professor Eric Hope
here from the University of Leicester So, thank you very much for
helping me out with this. -You’re welcome. And what was your first
reaction, by the way, when I said I want to try Caesium
with Fluorine? I thought you were totally
and utterly mad. Uh huh. That’s probably most
people’s reaction. Now we’ve designed this
apparatus with quite a lot of thought. One of the problems here
is that we want to do this at the Ri And transporting Fluorine is
a little bit tricky, is it? Certainly. It reacts vigorously, as we will
see, with virtually any element in the periodic table. Eric’s come up with this
fantastic idea of just filling the coils in the apparatus, this
plastic tubing that has been sensitised to fluorine
so it’s not going to react with it. Basically, what we have in here
is Fluorine, but at the same pressures there is in the
atmosphere around it that nothing’s going to leak in,
nothing’s going to leak out. So even if there was a major
event, then the Fluorine would not be released from
the apparatus. To show the extreme reactivity
of Fluorine, we’re going to set fire to something We all know how hard it is to
start a barbecue using this stuff This is charcoal, trying
to get it to burn with the oxygen from the air I’d be easy, though, if the
atmosphere contained Fluorine. Is this your one or
is this my one? -No that was yours, I think. OK, was it? -No. You see. OK, should we see the
reaction then? -Let’s have a go. This demonstrates the extreme
reactivity of Fluorine gas. This was a tiny quantity of
Fluorine being played onto the surface of the charcoal there. And as soon as the two came into
contact, there was this very violent reaction, generated
a lot of heat, as you saw the flames there. But the charcoal isn’t
terribly reactive. Caesium is much more reactive. So I think we should try
this reaction now then. This is my Caesium. Have you seen Caesium before? -No. There’s quite a lot of
it, isn’t there? Quite beautiful. -Beautiful, yes. And so dangerous. So this is a combination between
the two most reactive elements in the periodic
table. We’ve got Fluorine, the most
reactive non-metal, and Caesium, the most
reactive metal. Let’s push them through again. -Yep. Yeah, it looks good. All right, we are
nearly ready. I’ll lower this. -Yep, and I’ll turn. You look after your pipes. Incredibly beautiful
reaction there between Caesium and Fluorine. This intense light. And I don’t think many people
have seen that before.

100 thoughts on “Reacting Fluorine with Caesium – First Time on Camera

  1. Thank you, our Swedish friend, for translating this video into one of our favourite Nordic languages. Tack så mycket!

  2. wouldnt francium + fluorine be the most reactive? I know it's basically impossible to get but it kinda annoys me when they say that Caesium is the most reactive metal in the periodic table

  3. So, you mixed the two and got a light. What about it? It's certainly pretty, but did you measure anything? What can we learn from it? Can you explain the reaction? This is a very expensive, very impressive, useless video. There are people on youtube exploding shit with cleaning materials who make more interesting stuff by just explaining their chemistry and studying the reactions.

  4. I wonder if it would be possible to transform the cesium into a mist, like gasoline into an internal-combustion engine. It would have to be much more effective.

  5. really interesting. will it be possible to record a spectrum of the emitted light? I would like to see what frequencies are emitted other than the visible light.

  6. And now, You have created one of the most stable compounds, Caesium Fluoride, good luck freeing the caesium again without a lot of hard work from that, though I have to say I have always wanted to see this reaction. Made my day.

  7. "I thought you were totally and utterly mad!"

    Not me. I thought it would be an awesome idea (for someone else besides myself to do). That's why I searched youtube to see if anyone had done it.

  8. 3:16 …. anyone remember when Cody's Lab made a Youtube Play Button out of Cesium .. now that was a lot of Cesium

  9. Thanks to our amazing French friend, you can all now enjoy this video with French captions. Merci beaucoup!

  10. May we use 15 seconds of footage from this clip? It’s for a news story on radioactive Cesium being seized from a man’s home here in Texas.

  11. Nothing like the smell of carbon tetrafluoride in the morning! XD (among other carbon/fluorine compounds)

  12. What happens when you take the most electronegitive and positive elements florine and cesium and combined "bond" it with the most symmetrical anchor of carbon 12 rather then trying to get a reaction with out the carbon atom present? On the molecular level of course or well atomic level I suppose.

  13. doesn't caesium react with oxygen violently too? Then when the substance was carried out, it did not react at all. Is that really caesium that you showed there?

  14. Next time take a bath in 500L of cryogenically liquefied fluorine and have someone dump 250 kilograms of caesium. Should be safe

  15. Anyone noticed sparks of electricity right before the light. Well that was the electrons escaping cesium through the air into fluorine indicating the extreme affinity of both of them to each other

  16. i dont know but im pretty sure francium is much more reactive than ceasium as they use small amounts to blow ships out of the water

  17. Fluorine and Cesium come into contact
    shining light
    Fluorine: Thank you for the thing i finally needed ;-;
    Cesium: I got you bro

  18. If hydrogen bombs are H-bombs, then fluorine bombs would be F-bombs… this fact made me giggle in community college intro chemistry.

  19. I'd like to see chlorine triflouride mix with Cesium. It's an even more dangerous chemical than pure Fluorine, which isn't something you can say very often.

  20. Just say, "the most reactive halogen". You have non-metals, halogens, metaloids, and gases, as well as metals, so be more specific…

  21. If caesium explodes in water and burns in air and flourine can set fire to charcoal just by touching it, why din't they produce something extraordinary. I think your proportion or something is utterly wrong

  22. I want my lights at home like this. Just need a few tanks of fluorine and cesium and piping… like old fashioned gas lamps…

  23. Can you explain why francium is less reactive than ceasium, and then do some francium with the fluorine anyway just for shits and grins?

  24. Who else came here immediately after learning about periodic trends? I’m here but I need to study for my chem final:p

  25. Prof. Hope seems really emotionless and unreactive – probably a good trait for a fluorine chemist.

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