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Thread: bohr model: cloud or rings?

  1. #1 bohr model: cloud or rings? 
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    they teach you in middle school atoms have a nucleus with electrons around it. these electrons are on rings or levels going around the nucleus

    they taught that electrons are part of an obscure "cloud"

    that's two different picture models in the textbook

    thinking about it now i'm confused. which is right? why are there specific rings of electrons while also a mysterious cloud area?

    it doesn't fit together.

    chemical reactions are affected by valence electrons on the outer level. but we still aren't sure about where electrons are?

    very confused ............. thank you


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  3. #2  
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    what grade are you in now?

    how much do you know about the bohr model?

    Bohr model - Wikipedia, the free encyclopedia


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  4. #3  
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    Quote Originally Posted by brody View Post
    that's two different picture models in the textbook

    thinking about it now i'm confused. which is right? why are there specific rings of electrons while also a mysterious cloud area?

    it doesn't fit together.
    The cloud picture is essentially a depiction of the wave function of the electron in a particular state. The wave function represents all that quantum mechanics can tell you about the system. From the density of the cloud at any point, it would be possible to calculate the probability of finding the electron at that point. The earlier model which depicts electrons as being in planetary orbits is really a mixture of classical mechanics with a few pieces of quantum theory thrown in. However, whereas it is possible to observe the position and velocity of a planet in orbit, such observations couldn't be made on an electron in an atom.
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  5. #4  
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    It is helpful to think of electrons more as misty or mushy things rather than as discrete bits like marbles. The location of the electron, its orbital, is an area where there is a high likelyhood that there will be one electrons worth of charge at any time. The electron is not necessarily there all the time but it is its "address". This is analogus to how humans behave. If I know your home address, I know where I am likely to find you, but at any particular time you may not be home. You could be at work or at school or out goofing off.
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