about the quantum tunneling post, when you show the dark cloud that’s the probability for the electron or for the entire particle? when it has to do with passing through a barrier does it mean the entire atom passes through or just an electron or two? thanks

about the quantum tunneling post, when you show the dark cloud that's the probability for the electron or for the entire particle? when it has to do with passing through a barrier does it mean the entire atom passes through or just an electron or two?
thanks

Asked by e7v7a7n

That’s the probability for any particular particle. That probability cloud could be a proton, a nuclei, an entire atom (unlikely), or even an electron. Electrons use quantum tunnelling to escape their atoms on occasion.