Periodic table (electron configurations)

Configurations that are unavailable are guessed to be similar to the element directly above on the Periodic Table.
 * Grayed out electron numbers indicate subshells that are filled to their maximum.
 * Configurations of elements with light gray background are uncertain or not available.
 * The bracketed noble gas symbols on the left represent the inner configurations that are the same in each period. Written out these are:
 * He, 2, helium : 1s2
 * Ne, 10, neon : 1s2 2s2 2p6
 * Ar, 18, argon : 1s2 2s2 2p6 3s2 3p6
 * Kr, 36, krypton : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
 * Xe, 54, xenon : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
 * Rn, 86, radon : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6


 * Note the non-linear shell ordering, which comes about is due to the different energies of smaller and larger shells.