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Now remember electrons aren't little balls they are unimaginable wavicles with specific properties, now one of those properties involves the accuracy you can determine (or predict) position and momentum of the electron. [...] But the maths predicts this property: The wavefunction is all the information that exists about an electron, and you can see from the wavefuntion that if you create a scenario where you know its position with 100% accuracy, its momentum simply does not exist at any given value, likewise the reverse is true.
But the de Broglie Equation is meant as a method to make sense of matter behaving strangely like light. It's only a mathematical model. This in no way indicates that electrons (and the like) dont have set properties, it merely indicates that we are unable to