View source for Periodic table (electron configurations)



{| align="center" border="0" cellpadding=0 cellspacing=1 style="text-align:center"
|+ Electron configurations of the neutral gaseous atoms in the ground state.
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p>1s:</p>
| style="background:#a0ffa0;width:3%" | <small>[[hydrogen|1<br />H]]</small><p>1</p>
| colspan="30" |
| style="background:#c0ffff;width:3%" | <small>[[helium|2<br />He]]</small><p><span style="color:gray">2</span></p>
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p><small style="color:gray">&#91;He&#93;<br />+</small><br />2s:<br />2p:</p>
| style="background:#ff6666;width:3%" | <small>[[lithium|3<br />Li]]</small><p>1<br />-</p>
| style="background:#ffdead;width:3%" | <small>[[beryllium|4<br />Be]]</small><p><span style="color:gray">2</span><br />-</p>
| colspan="24" |
| style="background:#cccc99;width:3%" | <small>[[boron|5<br />B]]</small><p><span style="color:gray">2</span><br />1</p>
| style="background:#a0ffa0;width:3%" | <small>[[carbon|6<br />C]]</small><p><span style="color:gray">2</span><br />2</p>
| style="background:#a0ffa0;width:3%" | <small>[[nitrogen|7<br />N]]</small><p><span style="color:gray">2</span><br />3</p>
| style="background:#a0ffa0;width:3%" | <small>[[oxygen|8<br />O]]</small><p><span style="color:gray">2</span><br />4</p>
| style="background:#ffff99;width:3%" | <small>[[fluorine|9<br />F]]</small><p><span style="color:gray">2</span><br />5</p>
| style="background:#c0ffff;width:3%" | <small>[[neon|10<br />Ne]]</small><p><span style="color:gray">2<br />6</span></p>
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p><small style="color:gray">&#91;Ne&#93;<br />+</small><br />3s:<br />3p:</p>
| style="background:#ff6666;width:3%" | <small>[[sodium|11<br />Na]]</small><p>1<br />-</p>
| style="background:#ffdead;width:3%" | <small>[[magnesium|12<br />Mg]]</small><p><span style="color:gray">2</span><br />-</p>
| colspan="24" |
| style="background:#cccccc;width:3%" | <small>[[aluminium|13<br />Al]]</small><p><span style="color:gray">2</span><br />1</p>
| style="background:#cccc99;width:3%" | <small>[[silicon|14<br />Si]]</small><p><span style="color:gray">2</span><br />2</p>
| style="background:#a0ffa0;width:3%" | <small>[[phosphorus|15<br />P]]</small><p><span style="color:gray">2</span><br />3</p>
| style="background:#a0ffa0;width:3%" | <small>[[sulfur|16<br />S]]</small><p><span style="color:gray">2</span><br />4</p>
| style="background:#ffff99;width:3%" | <small>[[chlorine|17<br />Cl]]</small><p><span style="color:gray">2</span><br />5</p>
| style="background:#c0ffff;width:3%" | <small>[[argon|18<br />Ar]]</small><p><span style="color:gray">2<br />6</span></p>
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p><small style="color:gray">&#91;Ar&#93;<br />+</small><br />4s:<br />3d:<br />4p:</p>
| style="background:#ff6666;width:3%" | <small>[[potassium|19<br />K]]</small><p>1<br />-<br />-</p>
| style="background:#ffdead;width:3%" | <small>[[calcium|20<br />Ca]]</small><p><span style="color:gray">2</span><br />-<br />-</p>
| colspan="14" |
| style="background:#ffc0c0;width:3%" | <small>[[scandium|21<br />Sc]]</small><p><span style="color:gray">2</span><br />1<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[titanium|22<br />Ti]]</small><p><span style="color:gray">2</span><br />2<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[vanadium|23<br />V]]</small><p><span style="color:gray">2</span><br />3<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[chromium|24<br />Cr]]</small><p>1<br />5<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[manganese|25<br />Mn]]</small><p><span style="color:gray">2</span><br />5<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[iron|26<br />Fe]]</small><p><span style="color:gray">2</span><br />6<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[cobalt|27<br />Co]]</small><p><span style="color:gray">2</span><br />7<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[nickel|28<br />Ni]]</small><p><span style="color:gray">2</span><br />8<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[copper|29<br />Cu]]</small><p>1<br /><span style="color:gray">10</span><br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[zinc|30<br />Zn]]</small><p><span style="color:gray">2<br />10</span><br />-</p>
| style="background:#cccccc;width:3%" | <small>[[gallium|31<br />Ga]]</small><p><span style="color:gray">2<br />10</span><br />1</p>
| style="background:#cccc99;width:3%" | <small>[[germanium|32<br />Ge]]</small><p><span style="color:gray">2<br />10</span><br />2</p>
| style="background:#cccc99;width:3%" | <small>[[arsenic|33<br />As]]</small><p><span style="color:gray">2<br />10</span><br />3</p>
| style="background:#a0ffa0;width:3%" | <small>[[selenium|34<br />Se]]</small><p><span style="color:gray">2<br />10</span><br />4</p>
| style="background:#ffff99;width:3%" | <small>[[bromine|35<br />Br]]</small><p><span style="color:gray">2<br />10</span><br />5</p>
| style="background:#c0ffff;width:3%" | <small>[[krypton|36<br />Kr]]</small><p><span style="color:gray">2<br />10<br />6</span></p>
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p><small style="color:gray">&#91;Kr&#93;<br />+</small><br />5s:<br />4d:<br />5p:</p>
| style="background:#ff6666;width:3%" | <small>[[rubidium|37<br />Rb]]</small><p>1<br />-<br />-</p>
| style="background:#ffdead;width:3%" | <small>[[strontium|38<br />Sr]]</small><p><span style="color:gray">2</span><br />-<br />-</p>
| colspan="14" |
| style="background:#ffc0c0;width:3%" | <small>[[yttrium|39<br />Y]]</small><p><span style="color:gray">2</span><br />1<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[zirconium|40<br />Zr]]</small><p><span style="color:gray">2</span><br />2<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[niobium|41<br />Nb]]</small><p>1<br />4<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[molybdenum|42<br />Mo]]</small><p>1<br />5<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[technetium|43<br />Tc]]</small><p><span style="color:gray">2</span><br />5<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[ruthenium|44<br />Ru]]</small><p>1<br />7<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[rhodium|45<br />Rh]]</small><p>1<br />8<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[palladium|46<br />Pd]]</small><p>-<br /><span style="color:gray">10</span><br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[silver|47<br />Ag]]</small><p>1<br /><span style="color:gray">10</span><br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[cadmium|48<br />Cd]]</small><p><span style="color:gray">2<br />10</span><br />-</p>
| style="background:#cccccc;width:3%" | <small>[[indium|49<br />In]]</small><p><span style="color:gray">2<br />10</span><br />1</p>
| style="background:#cccccc;width:3%" | <small>[[tin|50<br />Sn]]</small><p><span style="color:gray">2<br />10</span><br />2</p>
| style="background:#cccc99;width:3%" | <small>[[antimony|51<br />Sb]]</small><p><span style="color:gray">2<br />10</span><br />3</p>
| style="background:#cccc99;width:3%" | <small>[[tellurium|52<br />Te]]</small><p><span style="color:gray">2<br />10</span><br />4</p>
| style="background:#ffff99;width:3%" | <small>[[iodine|53<br />I]]</small><p><span style="color:gray">2<br />10</span><br />5</p>
| style="background:#c0ffff;width:3%" | <small>[[xenon|54<br />Xe]]</small><p><span style="color:gray">2<br />10<br />6</span></p>
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p><small style="color:gray">&#91;Xe&#93;<br />+</small><br />6s:<br />4f:<br />5d:<br />6p:</p>
| style="background:#ff6666;width:3%" | <small>[[caesium|55<br />Cs]]</small><p>1<br />-<br />-<br />-</p>
| style="background:#ffdead;width:3%" | <small>[[barium|56<br />Ba]]</small><p><span style="color:gray">2</span><br />-<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[lanthanum|57<br />La]]</small><p><span style="color:gray">2</span><br />-<br />1<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[cerium|58<br />Ce]]</small><p><span style="color:gray">2</span><br />1<br />1<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[praseodymium|59<br />Pr]]</small><p><span style="color:gray">2</span><br />3<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[neodymium|60<br />Nd]]</small><p><span style="color:gray">2</span><br />4<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[promethium|61<br />Pm]]</small><p><span style="color:gray">2</span><br />5<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[samarium|62<br />Sm]]</small><p><span style="color:gray">2</span><br />6<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[europium|63<br />Eu]]</small><p><span style="color:gray">2</span><br />7<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[gadolinium|64<br />Gd]]</small><p><span style="color:gray">2</span><br />7<br />1<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[terbium|65<br />Tb]]</small><p><span style="color:gray">2</span><br />9<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[dysprosium|66<br />Dy]]</small><p><span style="color:gray">2</span><br />10<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[holmium|67<br />Ho]]</small><p><span style="color:gray">2</span><br />11<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[erbium|68<br />Er]]</small><p><span style="color:gray">2</span><br />12<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[thulium|69<br />Tm]]</small><p><span style="color:gray">2</span><br />13<br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[ytterbium|70<br />Yb]]</small><p><span style="color:gray">2<br />14</span><br />-<br />-</p>
| style="background:#ffbfff;width:3%" | <small>[[lutetium|71<br />Lu]]</small><p><span style="color:gray">2<br />14</span><br />1<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[hafnium|72<br />Hf]]</small><p><span style="color:gray">2<br />14</span><br />2<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[tantalum|73<br />Ta]]</small><p><span style="color:gray">2<br />14</span><br />3<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[tungsten|74<br />W]]</small><p><span style="color:gray">2<br />14</span><br />4<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[rhenium|75<br />Re]]</small><p><span style="color:gray">2<br />14</span><br />5<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[osmium|76<br />Os]]</small><p><span style="color:gray">2<br />14</span><br />6<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[iridium|77<br />Ir]]</small><p><span style="color:gray">2<br />14</span><br />7<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[platinum|78<br />Pt]]</small><p>1<br /><span style="color:gray">14</span><br />9<br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[gold|79<br />Au]]</small><p>1<br /><span style="color:gray">14<br />10</span><br />-</p>
| style="background:#ffc0c0;width:3%" | <small>[[mercury (element)|80<br />Hg]]</small><p><span style="color:gray">2<br />14<br />10</span><br />-</p>
| style="background:#cccccc;width:3%" | <small>[[thallium|81<br />Tl]]</small><p><span style="color:gray">2<br />14<br />10</span><br />1</p>
| style="background:#cccccc;width:3%" | <small>[[lead|82<br />Pb]]</small><p><span style="color:gray">2<br />14<br />10</span><br />2</p>
| style="background:#cccccc;width:3%" | <small>[[bismuth|83<br />Bi]]</small><p><span style="color:gray">2<br />14<br />10</span><br />3</p>
| style="background:#cccc99;width:3%" | <small>[[polonium|84<br />Po]]</small><p><span style="color:gray">2<br />14<br />10</span><br />4</p>
| style="background:#ffff99;width:3%" | <small>[[astatine|85<br />At]]</small><p><span style="color:gray">2<br />14<br />10</span><br />5</p>
| style="background:#c0ffff;width:3%" | <small>[[radon|86<br />Rn]]</small><p><span style="color:gray">2<br />14<br />10<br />6</span></p>
|-
| style="background:#f0f0f0;width:3%;vertical-align:bottom" | <p><small style="color:gray">&#91;Rn&#93;<br />+</small><br />7s:<br />5f:<br />6d:<br />7p:</p>
| style="background:#ff6666;width:3%" | <small>[[francium|87<br />Fr]]</small><p>1<br />-<br />-<br />-</p>
| style="background:#ffdead;width:3%" | <small>[[radium|88<br />Ra]]</small><p><span style="color:gray">2</span><br />-<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[actinium|89<br />Ac]]</small><p><span style="color:gray">2</span><br />-<br />1<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[thorium|90<br />Th]]</small><p><span style="color:gray">2</span><br />-<br />2<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[protactinium|91<br />Pa]]</small><p><span style="color:gray">2</span><br />2<br />1<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[uranium|92<br />U]]</small><p><span style="color:gray">2</span><br />3<br />1<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[neptunium|93<br />Np]]</small><p><span style="color:gray">2</span><br />4<br />1<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[plutonium|94<br />Pu]]</small><p><span style="color:gray">2</span><br />6<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[americium|95<br />Am]]</small><p><span style="color:gray">2</span><br />7<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[curium|96<br />Cm]]</small><p><span style="color:gray">2</span><br />7<br />1<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[berkelium|97<br />Bk]]</small><p><span style="color:gray">2</span><br />9<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[californium|98<br />Cf]]</small><p><span style="color:gray">2</span><br />10<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[einsteinium|99<br />Es]]</small><p><span style="color:gray">2</span><br />11<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[fermium|100<br />Fm]]</small><p><span style="color:gray">2</span><br />12<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[mendelevium|101<br />Md]]</small><p><span style="color:gray">2</span><br />13<br />-<br />-</p>
| style="background:#ff99cc;width:3%" | <small>[[nobelium|102<br />No]]</small><p><span style="color:gray">2<br />14</span><br />-<br />-</p>
| style="background:#f099cc;width:3%" | <small>[[lawrencium|103<br />Lr]]</small><p><span style="color:gray">2<br />14</span><br />-<br />1</p>
| style="background:#f0f0f0;width:3%" | <small>[[rutherfordium|104<br />Rf]]</small><p><span style="color:gray">2<br />14</span><br />2<br />-</p>
| style="background:#f0f0f0;width:3%" | <small>[[dubnium|105<br />Db]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[seaborgium|106<br />Sg]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[bohrium|107<br />Bh]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[hassium|108<br />Hs]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[meitnerium|109<br />Mt]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[darmstadtium|110<br />Ds]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[roentgenium|111<br />Rg]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununbium|112<br />Uub]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununtrium|113<br />Uut]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununquadium|114<br />Uuq]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununpentium|115<br />Uup]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununhexium|116<br />Uuh]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununseptium|117<br />Uus]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
| style="background:#f0f0f0;width:3%" | <small>[[ununoctium|118<br />Uuo]]</small><p>&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;</p>
|}
{{element color legend}}

* <span style="color:gray">Grayed out</span> electron numbers indicate subshells that are filled to their maximum.
* Configurations of elements with <span style="background:#f0f0f0">light gray</span> background are uncertain or not available.
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]] : 1s<sup>2</sup>
:: Ne, 10, [[neon]] : 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>6</sup>
:: Ar, 18, [[argon]] : 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>6</sup> 3s<sup>2</sup> 3p<sup>6</sup>
:: Kr, 36, [[krypton]] : 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>6</sup> 3s<sup>2</sup> 3p<sup>6</sup> 4s<sup>2</sup> 3d<sup>10</sup> 4p<sup>6</sup>
:: Xe, 54, [[xenon]] : 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>6</sup> 3s<sup>2</sup> 3p<sup>6</sup> 4s<sup>2</sup> 3d<sup>10</sup> 4p<sup>6</sup> 5s<sup>2</sup> 4d<sup>10</sup> 5p<sup>6</sup>
:: Rn, 86, [[radon]] : 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>6</sup> 3s<sup>2</sup> 3p<sup>6</sup> 4s<sup>2</sup> 3d<sup>10</sup> 4p<sup>6</sup> 5s<sup>2</sup> 4d<sup>10</sup> 5p<sup>6</sup> 6s<sup>2</sup> 4f<sup>14</sup> 5d<sup>10</sup> 6p<sup>6</sup>
* ''Note the non-linear shell ordering, which comes about is due to the different energies of smaller and larger shells.''

== References ==
[[electron configurations of the elements (data page)]]

{{PeriodicTablesFooter}}

[[Category:Periodic table]]

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