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    In my notes i have written that the nucleus/particles fromed in both fission and fusion both have less mass than the nucleuses/particles before the process, surely this cant b correct! Also i have written that they both release energy.
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    No in fission they have less mass, in fusion more mass. Thje most common fusion and fission reactions release energy
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    Yep, I agree with rpotter.

    I think of it like this: during the fission and the fusion reactions discussed in our specification, the Binding Energy per nucleon increases. Therefore that means energy will have been transferred to the surroundings.

    Hope that helps.
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    In both fission and fusion there is an increase in BE per nucleon (hence an increase in stability). However.....
    With fission, the combined mass of the products is always less than the initial mass of the nucleus. The mass defect is proportional to the energy released from fisson as E=mc^2
    With fussion, the mass of the the nuclues which is formed is always less than the combined mass of the initial nuclides.
    Remember, nuclear fission or fusion is only possible when the mass decreases.
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    in fission, U-235 splits into two smaller daughter nuclides and up to 3 neutrons. however, the mass of the U-235 is greater than the combined mass of the daughter nuclides and neutrons. the mass difference between the U-235 and products is the energy produced...

    in fusion, the combined mass of the hydrogens used is more than the helium-4 produced, again the mass difference is the energy produced by the reaction...
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    [QUOTE=Remember, nuclear fission or fusion is only possible when the mass decreases.[/QUOTE]

    Not actually true, under extreme conditions equilibrium reactions producing nuclei of the same combined or even greater mass can be achieved
 
 
 
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