Periodic Table: Wave Functions I.
This visualization of the periodic table shows the wave function of the outermost electron. The wave function is the solution of the Schrödinger equation and describes the electron in its wave form. Yellow and red colors show positive, while blue and purple denote negative values. All atoms other than hydrogen are approximated with hydrogen for simplicity. In reality the wave functions will look somewhat, but not too different.
All atoms are on the same scale. This favors the visibility of heavy elements, as they are much larger than light elements. Another version of this figure, which uses the same size for all orbitals can be found here: