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the part that makes the uncertainty greater than the speed of light is the fact that the atom is contained. If the atom is not contained the uncertianty drops making it realistic. So the specific point that makes it unrealistic is confining an e- to a certain place
When you work out the velocity for the electron when it is confined within the 1.7x10^-15 m of the nucleus, the velocity is 3.4x10^10 which is greater than the speed of light (3.00x10^8). The unrealistic velocity value is telling us that the electron cannot be confined within the nucleus.
When you apply the Heisenberg's equation to the incorrect atomic model, we get the result that the uncertainty in electrons' velocity is greater than the speed of light, which is unrealistic. Therefore this atomic model must be wrong and electrons do not located in the nucleus and are not confined to its nuclear diameter.
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