- Periodic table (electron configurations)
* Configurations of elements with light gray background are uncertain or not available.
* Grayed out electron numbers indicate subshells that are filled to their maximum.Configurations that are unavailable are guessed to be similar to the element directly above on the Periodic Table.
* 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:: Uuo, 118, Ununoctium: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6
* "Note the non-linear shell ordering, which comes about due to the different energies of smaller and larger shells."
electron configurations of the elements (data page)
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