# nodes and probability density

The square of the wavefunction gives probability density of finding an electron somewhere in the orbital.

The text I'm referring to says that the value of probability density is always higher than zero at any finite distance from the nucleus.

so if probability density cannot be zero, then what about nodes? Arent they regions where probabilty density is zero?

• What is a "node" here? Oct 6, 2020 at 13:46
• A node is in the orbital context generally a 3D surface with the zero $|\Psi|^2$ value, what has interpretation as zero probability of an electron occurance. Oct 6, 2020 at 15:04

All higher s orbitals with n>1 have n-1 radial nodes, having zero $$|\Psi|^2$$ value of wave function at n-1 different radii.