Question

question 20 (1 point)
what is heisenbergs uncertainty principle?
electrons are negatively charged and nuclei are positively charged.
it is impossible to predict the spin of a moving electron.
it is impossible to know the exact position and speed of an electron at a given time.
electrons travel in discrete orbitals around the nucleus.

Explanation:

Heisenberg's uncertainty principle states that it is impossible to simultaneously know the exact position and the exact momentum (which is related to speed) of a particle like an electron. The first option is just about charges, the second about spin (not the principle), and the fourth is about orbitals (Bohr - like concept, not the uncertainty principle).

Answer:

It is impossible to know the exact position and speed of an electron at a given time.