* Configurations of elements 109 and above are not available. Predictions from reliable sources have been used for these elements.
*
Grayed out electron numbers indicate subshells that are filled to their maximum.
* 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
Helium (from el, ἥλιος, helios, lit=sun) is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. ...
: 1s
2
:: Ne, 10,
neon : 1s
2 2s
2 2p
6
:: Ar, 18,
argon
Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv). It is more than twice as ...
: 1s
2 2s
2 2p
6 3s
2 3p
6
:: Kr, 36,
krypton
Krypton (from grc, κρυπτός, translit=kryptos 'the hidden one') is a chemical element with the symbol Kr and atomic number 36. It is a colorless, odorless, tasteless noble gas that occurs in trace amounts in the atmosphere and is often ...
: 1s
2 2s
2 2p
6 3s
2 3p
6 4s
2 3d
10 4p
6
:: Xe, 54,
xenon
Xenon is a chemical element with the symbol Xe and atomic number 54. It is a dense, colorless, odorless noble gas found in Earth's atmosphere in trace amounts. Although generally unreactive, it can undergo a few chemical reactions such as the ...
: 1s
2 2s
2 2p
6 3s
2 3p
6 4s
2 3d
10 4p
6 5s
2 4d
10 5p
6
:: Rn, 86,
radon
Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colourless, odourless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through ...
: 1s
2 2s
2 2p
6 3s
2 3p
6 4s
2 3d
10 4p
6 5s
2 4d
10 5p
6 6s
2 4f
14 5d
10 6p
6
:: Og, 118,
oganesson
Oganesson is a synthetic chemical element with the symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, near Moscow, Russia, by a joint team of Russian and American scient ...
: 1s
2 2s
2 2p
6 3s
2 3p
6 4s
2 3d
10 4p
6 5s
2 4d
10 5p
6 6s
2 4f
14 5d
10 6p
6 7s
2 5f
14 6d
10 7p
6
* Note that these electron configurations are given for neutral atoms in the gas phase, which are not the same as the electron configurations for the same atoms in chemical environments. In many cases, multiple configurations are within a small range of energies and the small irregularities that arise in the d- and f-blocks are quite irrelevant chemically.
The construction of the periodic table ignores these irregularities and is based on ideal electron configurations.
* ''Note the non-linear shell ordering, which comes about due to the different energies of smaller and larger shells.''
References
See list of sources at
Electron configurations of the elements (data page)
This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell. Elect ...
.
{{DEFAULTSORT:Periodic Table (Electron Configurations)
Electron configurations
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon at ...