Atomic Cookies! @ Evil Mad Scientist Laboratories. Yum –

The basic picture of the atom that many of us grew up with– that of little electrons orbiting the nucleus like so many planets orbiting the sun –turns out to be a little misleading. Reality is somewhat more complicated: a matter of wave functions, spherical harmonics, and ultimately probability clouds.

The chart above shows the appearance of a single hydrogen atom in a few of its lowest excited states. In each of those states, the electron is found in a different orbital, some of which have unfamiliar shapes. But even the term “shape” is a little funny for something that you can’t hold in your hand. These are actually probability density plots, which show the likelihood of observing the electron in any one position at a given time– and more correctly, 2D projections of 3D probability densities.

So even the humble hydrogen atom can be a bit complex. Fortunately, we have advanced technology that can help us cut though the quantum mechanical haze: Cookies!