# +/- in p orbitals

1. ### hokhani

311
In the attached figure, what is the physical meaning of signs + and - in opposite lobes of p orbitals?

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2. ### daveyrocket

185
Those indicate the phase of the p orbitals. Recall that p orbitals have a node, so that, e.g. for the left one the function is positive to the right of the y axis and negative to the left of the y axis.

3. ### hokhani

311
Thank you. Do you mean that it is due to the radial part of wave function? If so, how to realize between px and py?

4. ### daveyrocket

185
No it's actually do to the angular part. px and py are just rotations of pz.