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Why are elements and compounds pure substances while homogeneous mixtures are not?

This, again, makes no sense if you can help that would be perfect.

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Tiny lego analogy:
Element= a bucket of yellow legos (ex. pure helium)
Compound= bucket of (yellow legos that are attached to 2 green legos) (ex. water (H2O= 2 Hydrogen and 1Oxygen bound to each other)
Homogeneous mixture= a bucket full of any different color of lego some of them bound together and some of them not. But because it is so random, the different combinations like green with blue or just plain blue are equally dispersed in the bucket ( ex. Air (oxygen + h20 + CO2 ect...)

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