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Thread: Uranium

  1. #1 Uranium 
    Forum Professor leohopkins's Avatar
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    Can uranium exist in compounds with other elements ?
    I have never seen this.

    My other question is, I know its possible to decay uranium 238 to uranium 235 but is it also possible to decay uranium into other elements ?

    Could we decay uranium into hydrogen, and like wise can we fuse a load of hydrogen together to create uranium ?


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  3. #2  
    Forum Isotope Zelos's Avatar
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    uranium exist in components
    http://en.wikipedia.org/wiki/Uranium

    My other question is, I know its possible to decay uranium 238 to uranium 235 but is it also possible to decay uranium into other elements ?
    as far as i know there is no nuclear reaction that only sends out neutrons so id say no you cant make U-238 to U-235 but you can enrich the uranium so it contain higher % of U-235

    Could we decay uranium into hydrogen, and like wise can we fuse a load of hydrogen together to create uranium ?
    decay is rather natural to happen and it wont happen since it will require massive amount of energy. But the other way around is possible since the amount of energy you get until Fe is more, i think, than whats required to keep building up to uranium. This is what happens at supernovas where all elements heavier than Fe but as said it requires energy.


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  4. #3  
    Moderator Moderator AlexP's Avatar
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    Uranium can exist in compounds with other elements...i've heard of Uranium oxide.

    i believe uranium would eventually decay into Pb, and that's stable, and thus won't decay further.
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  5. #4  
    Forum Sophomore Matt Lacey's Avatar
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    Like the rest of the actinides, Uranium has some chemistry, and even though it's radioactive, its half-life is about 4 billion years, so it decays incredibly slowly anyway.

    Also as Zelos said, Uranium 238 won't decay into 235, off the top of my head <sup>238</sup>U undergoes alpha decay to Thorium so in that sense it does decay to new elements - which then undergo further decay and end up at Pb, like Chemboy said.

    As for nucleosynthesis (building up new elements from smaller ones), it can be done in very small quantities with whacking great accelerators, but it's not particularly easy. You've also got the problem of then collecting what you've made. The only thing I can think of that does nucleosynthesis in any useful quantity is the Sun.

    I can however think of one example where new elements are created in high quantities although it's not really smashing different elements together - Technetium is a synthetic element which can be made by colliding neutrons with <sup>98</sup>Mo (as MoO<sub>4</sub><sup>-</sup>) to form a metastable <sup>99</sup>Tc nucleus, which has a half-life of 6 hours and is used in thyroid imaging (if I remember correctly).
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  6. #5 Half life 
    Forum Professor leohopkins's Avatar
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    Thats interesting. The half-life of uranium is 4 billion years old. (roughly the age of the earth)

    Shouldnt that mean then in principle that we should not be able to find any natural uranium ?

    Furthermore, does anyone know what the half-life of unidecium is ?

    AND.....

    Can anyone tell me, if you dropped a kilogram of Francium into water. Would that not create a nuclear type of explosion ?
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  7. #6 Re: Half life 
    Forum Isotope Zelos's Avatar
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    Quote Originally Posted by leohopkins
    Thats interesting. The half-life of uranium is 4 billion years old. (roughly the age of the earth)

    Shouldnt that mean then in principle that we should not be able to find any natural uranium ?

    Furthermore, does anyone know what the half-life of unidecium is ?

    AND.....

    Can anyone tell me, if you dropped a kilogram of Francium into water. Would that not create a nuclear type of explosion ?
    1: the HALF life is 4 billion years old meaning HALF of all uranium is gone by now the remaining HALF is still here to use

    2: undecium? i think youre refering to ununnilium and i think wiki is the best one to check then

    3: Nope its a hydrogen explosion not nuclear
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  8. #7  
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    It is stated that less than 500gm of francium exist on eath at any given time. Therefore you would hav to 1st find a way to collect 1 of te rarest element n accumulate it under stable conditions where it will not react with anything before u can obtain enough francium. You'll hav to do all this in a very short amount of time given that francium's longest living isotope only has like 20+ mins of half life. But that aside.... 1kg of francium would theoratically react with sufficient water and giv u an even more violent explosion than a nuclear bomb explosion.
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  9. #8  
    Forum Isotope Zelos's Avatar
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    Quote Originally Posted by Dark_PAst27
    It is stated that less than 500gm of francium exist on eath at any given time. Therefore you would hav to 1st find a way to collect 1 of te rarest element n accumulate it under stable conditions where it will not react with anything before u can obtain enough francium. You'll hav to do all this in a very short amount of time given that francium's longest living isotope only has like 20+ mins of half life. But that aside.... 1kg of francium would theoratically react with sufficient water and giv u an even more violent explosion than a nuclear bomb explosion.
    sweet
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

    The king of posting
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