### What is a node?

Posted:

**Wed Oct 18, 2017 10:29 pm**One thing that is confusing me about the Schrodinger equation section is the node definition. What exactly is a node? And also what does it mean by the wavefunction passing 0?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=117&t=22405

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Posted: **Wed Oct 18, 2017 10:29 pm**

One thing that is confusing me about the Schrodinger equation section is the node definition. What exactly is a node? And also what does it mean by the wavefunction passing 0?

Posted: **Wed Oct 18, 2017 11:11 pm**

So my understanding of it is that a node is where the wavefunction passes through zero - meaning it goes from positive to negative or vice versa - rather than just hitting zero and going back the way it came, as though reflected (not changing sign). So while a wavefunction can equal zero, it doesn't necessarily mean that that point is a node if it doesn't cross zero. Hope that helps!

Posted: **Thu Oct 19, 2017 10:56 am**

Also, at a node, the wavefunction is zero, so the electron density at the node is also zero, and the probability of finding an electron there is zero.

Posted: **Sun Oct 22, 2017 7:15 pm**

Just to reiterate, keep in mind that the node is where the wavefunction passes through zero, it doesn't just reach zero.

Posted: **Sun Oct 22, 2017 9:26 pm**

Yes, correct me if I'm wrong but I think of a node as having zero possibility of an electron being in that space.

Posted: **Sun Oct 22, 2017 10:21 pm**

Yes, a node is where the wave function passes through zero