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    What is the difference between molecules and ions,

    why can ions not be molecules?
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    Molecules form when atoms covalently bond to one another. Ions are atoms that have gained or lost electrons and thus have a charge. You can have polyatomic ions, formed when molecules gain or lose electrons.
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    (Original post by Daddy Dagoth)
    Molecules form when atoms covalently bond to one another. Ions are atoms that have gained or lost electrons and thus have a charge. You can have polyatomic ions, formed when molecules gain or lose electrons.
    Most polyatomic ions are not the result of molecules simply losing or gaining electrons in some chemical reaction.
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    (Original post by TutorsChemistry)
    Most polyatomic ions are not the result of molecules simply losing or gaining electrons in some chemical reaction.
    You're right, a better way to put it would simply be "a molecule with a charge".
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    Ions are charged particles .. end of.
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    (Original post by Daddy Dagoth)
    You're right, a better way to put it would simply be "a molecule with a charge".
    I see where you are coming from, and I'm not trying to argue.

    I do think that statement is confusing too. For example, these molecules don't exist: NH4, H3O, CO3, PO4 etc.

    A polyatomic ion is a group of bonded atoms with an overall charge on that group. It's an entity that can't be isolated like a molecule can be.
 
 
 
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