[S4one]

How does the electron cross the node in the “p cloud”? 
I just need a thought on this subject, my teacher said there is no right anwser but I need some info on it to right. Thanks

[FeLiXe]

you just don't ask yourself that in quantum chemistry

I guess an explanation might be according to Heisenberg: saying that the electron passes through the node would require to know it's position and momentem with very high accuracy. and this accuracy would be higher than allowed according to the uncertainty principle

gernerally you don't have tracectories in quantum mechanics. you don't know how particles move around. again because of Heisenberg.

[Yggdrasil]

This really isn't an answer, but the fact that electrons can pass through forbidden regions (e.g. nodes) is known as tunneling.

[FeLiXe]

is it really tunneling?

in my eyes tunneling talks about an electron being in or going through a classicaly forbidden region. but you don't have a classicaly forbidden region here. besides that the probability of an electron being in a classically forbidden region does not have to be zero.

I am staying with Heisenberg: You can't ask the question because it's beyond Heisenberg.

[S4one]

Thanks for the replies
I understand what you guys are saying, that people do not ask this question in Chem but thats exactly what my teacher wants us to do. She wants up to come up with an answer on how the electron cross.
After some thinking, I decided that the electron crosses underneath the node. Can you guys help me explain how this would be?
My class is not a "real" chem class, rather a chem and the environment class. I have never taken chem before so it is hard for me to think and come up with thoughts in the way that chemists would.  Thanks!

[FeLiXe]

I can try to explain it again: in quantum mechanics movement does not work the way you are used to. the question how the electron moves is irrelevant. you can check out http://en.wikipedia.org/wiki/Uncertainty_principle or other articles about quantum mechanics.

the electron behaves like a wave not like an actual particle moving around.

it is not possible to talk about an electron's movement at such a tiny scale because this would violate the uncertainty principle.

if you want more explanation you may want to try a physics forum.