Question

why does the uncertainty principle make it impossible to predict a trajectory for the electron? match the words in the left column to the appropriate blanks in the sentences on the right.
can
can not
the position and velocity of the electron
the position and force acting on the electron
the velocity and force acting on the electron
because the uncertainty principle says that you □ know both □ simultaneously, you cannot predict the trajectory.

Explanation:

The Heisenberg Uncertainty Principle states that it is impossible to simultaneously know both the exact position and exact velocity (or momentum) of a particle like an electron with arbitrary precision. So, the first blank should be "can not" because the principle implies the inability to know both, and the second blank should be "the position and velocity of the electron" as those are the two quantities the uncertainty principle relates to in terms of simultaneous knowledge.

Answer:

First blank: can not
Second blank: the position and velocity of the electron

The completed sentence: Because the uncertainty principle says that you can not know both the position and velocity of the electron simultaneously, you cannot predict the trajectory.