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    I was doing some particle physics past paper questions and I came across this written in the paper:

    "A neutron is a fundamental particle: false"

    I thought that both fermions and bosons were all elementary particles? Atleast that's what it says on Wikipedia.

    Can someone ratify this?
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    Fundamental means that it isn't made up of anything else.
    A neutron has a substructure consisting of three quarks, therefore it is not fundamental.
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    (Original post by Van_der_Waals)
    Fundamental means that it isn't made up of anything else.
    A neutron has a substructure consisting of three quarks, therefore it is not fundamental.
    Hang on though leptons aren't made of quarks but they're elementary?
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    (Original post by Dededex)
    Hang on though leptons aren't made of quarks but they're elementary?
    Anything without substructure is fundamental/elementary, so quarks, leptons and bosons are all fundamental/elementary.

    Anything with substructue is not fundamental, so mesons and baryons (hadrons) are not fundamental.
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    (Original post by Dededex)
    Hang on though leptons aren't made of quarks but they're elementary?
    As Van_der_Waals says above, fundamental means that it isn't made up of anything else. Hadrons and mesons are made of quarks, and so are not fundamental. Leptons aren't made of anything smaller (so far as we know), and so are fundamental.

    There's no simple rule that says if bosons or fermions are fundamental or not - some are, some aren't. Bosons and fermions are large categories that encompass particles with various properties.
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    (incomplete) Under 'normal' circumstances, a fundamental particle is one that cannot be broken down by chemical or physical means into smaller consituent parts.
    e.g. an atom goes to protons, neutrons, electrons

    proton --> 2 up quarks, 1 down, although sure they cannot exist on their own
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    (Original post by Pangol)
    As Van_der_Waals says above, fundamental means that it isn't made up of anything else. Hadrons and mesons are made of quarks, and so are not fundamental. Leptons aren't made of anything smaller (so far as we know), and so are fundamental.

    There's no simple rule that says if bosons or fermions are fundamental or not - some are, some aren't. Bosons and fermions are large categories that encompass particles with various properties.
    Sorry to all and Van Der Waal's - I misread haha!
 
 
 
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