Electron configurations
Shell structure and orbital filling for all 118 elements. Configurations are computed from the Madelung rule, with the 21 documented exceptions applied and explained.
°C
-273 °C5727 °C
Reference points
Block sBlock pBlock dBlock f
2009
118 elements known
13002009
Milestones
Categories
1gHhydrogen1.0082gHehelium4.00263sLilithium6.944sBeberyllium9.01225sBboron10.816sCcarbon12.0117gNnitrogen14.0078gOoxygen15.9999gFfluorine18.99810gNeneon20.1811sNasodium22.9912sMgmagnesium24.30513sAlaluminium26.98214sSisilicon28.08515sPphosphorus30.97416sSsulfur32.0617gClchlorine35.4518gArargon39.9519sKpotassium39.09820sCacalcium40.07821sScscandium44.95622sTititanium47.86723sVvanadium50.94224sCrchromium51.99625sMnmanganese54.93826sFeiron55.84527sCocobalt58.93328sNinickel58.69329sCucopper63.54630sZnzinc65.3831sGagallium69.72332sGegermanium72.6333sAsarsenic74.92234sSeselenium78.97135lBrbromine79.90436gKrkrypton83.79837sRbrubidium85.46838sSrstrontium87.6239sYyttrium88.90640sZrzirconium91.22441sNbniobium92.90642sMomolybdenum95.9543sTctechnetium9844sRuruthenium101.0745sRhrhodium102.9146sPdpalladium106.4247sAgsilver107.8748sCdcadmium112.4149sInindium114.8250sSntin118.7151sSbantimony121.7652sTetellurium127.653sIiodine126.954gXexenon131.2955sCscaesium132.9156sBabarium137.3357sLalanthanum138.9158sCecerium140.1259sPrpraseodymium140.9160sNdneodymium144.2461sPmpromethium14562sSmsamarium150.3663sEueuropium151.9664sGdgadolinium157.2565sTbterbium158.9366sDydysprosium162.567sHoholmium164.9368sErerbium167.2669sTmthulium168.9370sYbytterbium173.0571sLulutetium174.9772sHfhafnium178.4973sTatantalum180.9574sWtungsten183.8475sRerhenium186.2176sOsosmium190.2377sIriridium192.2278sPtplatinum195.0879sAugold196.9780lHgmercury200.5981sTlthallium204.3882sPblead207.283sBibismuth208.9884sPopolonium20985sAtastatine21086gRnradon22287sFrfrancium22388sRaradium22689sAcactinium22790sThthorium232.0491sPaprotactinium231.0492sUuranium238.0393sNpneptunium23794sPuplutonium24495nAmamericium24396nCmcurium24797nBkberkelium24798nCfcalifornium25199nEseinsteinium252100nFmfermium257101nMdmendelevium258102nNonobelium259103nLrlawrencium266104nRfrutherfordium267105nDbdubnium268106nSgseaborgium269107nBhbohrium270108nHshassium277109nMtmeitnerium278110nDsdarmstadtium281111nRgroentgenium282112nCncopernicium285113nNhnihonium286114nFlflerovium289115nMcmoscovium290116nLvlivermorium293117nTstennessine294118nOgoganesson294
State at 25 °Cs = solidl = liquidg = gasn = not naturally occurring
Rubidium
[Kr] 5s¹
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s¹
11s1s, 2 of 2 electrons
22s2s, 2 of 2 electrons2p2p, 6 of 6 electrons
33s3s, 2 of 2 electrons3p3p, 6 of 6 electrons3d3d, 10 of 10 electrons
44s4s, 2 of 2 electrons4p4p, 6 of 6 electrons
55s5s, 1 of 2 electrons
- Valence electrons
- 1
- Energy levels
- 2, 8, 18, 8, 1
- HOAO
- 5s
Configuration computed from the Madelung rule with documented exceptions · verified so orbital occupancies sum to Z