Uncertainty Principle real? can velocity and mass of electron be measured and moreso position?

Question

The electron position moves on a global trajectory of a changing cloud how can we tell its position it appears indeterminate?So neither position or instantaneous velocity can be measured?

Heisenberg principle says that you can measure momentum or position but not at the same time whithout taken into account that mass change?Does the principle hold water at all?

Was Einstein right after all?about the principle not being at the mercy of dice?

Answer 1

Are you talking about the probability where the electrons be in the shell ?

Answer 2

You have answered your own question