Probability density |ψ_{n,l,m}|² in the x-z plane. The wavefunction is ψ = R_{nl}(r) · Y_l^m(θ,φ). Radial part uses associated Laguerre polynomials; angular part uses real spherical harmonics. Units: Bohr radii (a₀ = 0.529 Å).
Darker = higher probability density. Nodes (zero crossings) appear as dark bands. The number of radial nodes = n − l − 1; angular nodes = l. Energy E_n = -13.6/n² eV depends only on n.