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  • Hello everyone. Today I will tell you about the most active and unusual metal on earth: Cesium.

  • Cesium is an active alkaline metal, which is located near the bottom of the periodic table of chemical elements

  • only Francium(Fr) can be more active than Cesium(Cs).

  • but that metal is radioactive and an un insignificant amount of it

  • was obtained in its pure form to do any experiments with it.

  • because of its high activity, metallic Cesium is being stored in special ampules

  • and inert atmosphere of either Argon or Hydrogen.

  • Appearance wise, Cesium has a yellowish tint like gold.

  • but the price for Cesium is still higher than Gold

  • due to its extremely small sales market and its highest activity,

  • price of Cesium can reach over €100 per gram.

  • The vial, you should see on the screen, is 50 grams of cesium.

  • Just imagine it's cost.

  • Cesium is unusual, that it has a very low melting pointonly 29℃.

  • If you take a vial of Cesium in hand,

  • you can see how quickly the metal begins to melt.

  • Even while Cesium is still in the vial, we can already conduct experiment with it.

  • If you leave the liquid Cesium, in a vial for some time,

  • it partially hardens, forming very beautiful crystals of pure Cesium

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  • Also, due to Cesium's solidification, its volume is being significantly reduced

  • as can be clearly seen with a funnel formed from solidified Cesium in the ampule.

  • Now, lets proceed to the most interesting part: conducting experiments with Cesium.

  • Firstly, to get the Cesium out of the vial, I decided to melt it in the vial

  • and then pour out the liquid Cesium in kerosene.

  • However, something went wrong during that part.

  • cracking and screaming

  • The liquid Cesium instantly ignited in air, burning everything around it.

  • That happened most likely due to the fact that the Cesium in the vial was liquid

  • after the hammer happened, the top of the vial broke off, pouring Cesium onto the table.

  • You can see what happens next, the table is now out of use.

  • But that's okay, we still have more tables.

  • For further experiments, we get to buy another vial of Cesium.

  • Now I decided to do things differently: break the end of ampule with solid Cesium and then heat in kerosene

  • This all turned out well, gradually the liquid Cesium began to flow from the vial into the kerosene.

  • After reach it immediately lost its golden shine and get covered with a layer of oxides and peroxides.

  • Due to the impurity of water and oxygen in kerosene, I have decided to destroy

  • the vial with the remains of liquid Cesium by throwing it onto a wet wall.

  • Explosion

  • After solidifying, the Cesium can be easily cut, even with a spatula.

  • And it is not just the most active, but also the softest metal in the world.

  • It resembles margarine for its softness.

  • For the first time on YouTube, you can now observe Cesium is being cut.

  • First, I took a piece of Cesium, and put it on a piece of wood.

  • Cesium melts from the oxidation reaction of oxygen in the air

  • and then self ignites with a beautiful magenta flame due to Cesium ions.

  • Burning

  • Cesium also behaves similarly on the napkin.

  • Burning

  • Furthermore, by analogy with Rubidium, I decided to conduct the reaction of Cesium with sand.

  • Igniting Cesium on sand, similarly to rubidium, Cesium reacts with the silica

  • which the sand consists of very calmly and forms a beautiful sandy surface and also, an amorphous silicon.

  • Next, I decided to let hot Cesium react with manganese sulfate, the response wasn't very rough.

  • But it is better that it was with sand, when it's formed a metal manganese.

  • The coolest reaction by far was Cesium with sulfur.

  • Where we throw the piece of Cesium in molten sulfur.

  • crack and explosion

  • In that reaction the two elements forms Cesium sulfide.

  • Also we decided to fuse copper with cesium,

  • with that an unusual compound was formed, the intermetallic compound of copper and cesium

  • which eventually decayed due to cesium's oxidation by atmospheric oxygen.

  • If you throw a piece of Cesium into the glass filled with ethanol, Cesium will self ignite even in alcohol,

  • coloring the flame of alcohol to beautiful purple due to Cesium ions.

  • Lastly, we decided to throw about 20 grams of Cesium in container filled with the ice water.

  • Explosion

  • As you can see, Cesium explodes on the first contact with water.

  • Although not so strongly as it's sometimes portrayed in other videos.

  • Cesium has a variety of applications, these days metallic Cesium is used in the most accurate atomic clocks.

  • The error of which is only a second per 100 million years.

  • Also, Cesium is used in the new engines for orbital satellites.

  • Until about the early 2000s, before the rise of micro electronics,

  • Cesium has been widely used in photocells and motion sensors.

  • However, after the market has been flooded with cheap transistor analogies,

  • the need of such a number of manufacturing metallic cesium disappeared and the price had since arisen sharply.

  • And lastly, I would like to thank the company MEL Science.

  • Without them, the production of this video would have been impossible.

  • The Cesium was worth a lot of money, not mention the burning of the table.

  • It was all done for science, and so that you, my channel viewer,

  • who would learn a lot of about this amazing metal, Cesium.

  • Like the video if you enjoyed it, subscribe my channel, and also visit the website site of our sponsor, MEL Science.

  • Thank you for watching!

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B2 H-INT US cesium vial metal liquid kerosene due

Cesium - The most ACTIVE metal on EARTH!

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    deghyp posted on 2019/12/28
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