Weblink 2.1 Three-dimensional representations of the 1s, 2s and 2p AOs cut into cubes

This applet shows a representation of the wavefunction corresponding to an atomic orbital. The nucleus is at the centre of the large cube, which is subdivided into many smaller cubes. Each small cube is then shaded according to the value of the wavefunction in the middle of that cube: darker shading means a larger value of the wavefunction, with red shading for positive values and blue for negative.