Dmitri Ivanovitch Mendeleïev publie la classification périodique des éléments en 1869.
numéro atomiquemasse molaire atomique g·mol-1LanthanidesActinides1Hhydrogène1.02Hehélium4.03Lilithium6.94Bebéryllium9.05Bbore10.86Ccarbone12.07Nazote14.08Ooxygène16.09Ffluor19.010Nenéon20.211Nasodium23.012Mgmagnésium24.313Alaluminium27.014Sisilicium28.115Pphosphore31.016Ssoufre32.117Clchlore35.518Arargon39.919Kpotassium39.120Cacalcium40.121Scscandium45.022Tititane47.923Vvanadium50.924Crchrome52.025Mnmanganèse54.926Fefer55.827Cocobalt58.928Ninickel58.729Cucuivre63.530Znzinc65.431Gagallium69.732Gegermanium72.633Asarsenic74.934Sesélénium79.035Brbrome79.936Krkrypton83.837Rbrubidium85.538Srstrontium87.639Yyttrium88.940Zrzirconium91.241Nbniobium92.942Momolybdène95.943Tctechnétium99.044Ruruthénium101.145Rhrhodium102.946Pdpalladium106.447Agargent107.948Cdcadmium112.449Inindium114.850Snétain118.751Sbantimoine121.852Tetellure127.653Iiode126.954Xexénon131.355Cscésium132.956Babaryum137.357Lalanthane138.958Cecérium140.159Prpraséodyme140.960Ndnéodyme144.261Pmprométhium145.062Smsamarium150.463Eueuropium152.064Gdgadolinium157.365Tbterbium158.966Dydysprosium162.567Hoholmium164.968Ererbium167.369Tmthulium168.970Ybytterbium173.071Lulutétium175.072Hfhafnium178.573Tatantale180.974Wtungstène183.975Rerhénium186.276Ososmium190.277Iriridium192.278Ptplatine195.179Auor197.080Hgmercure200.681Tlthallium204.482Pbplomb207.283Bibismuth209.084Popolonium210.085Atastate210.086Rnradon222.087Frfrancium223.088Raradium226.089Acactinium227.090Ththorium232.091Paprotactinium231.092Uuranium238.093Npneptunium237.094Puplutonium242.095Amaméricium243.096Cmcurium247.097Bkberkélium247.098Cfcalifornium251.099Eseinsteinium254.0100Fmfermium253.0101Mdmendélévium256.0102Nonobélium254.0103Lrlawrencium257.0104Rfrutherfordium261105Dbdubnium262106Sgseaborgium266107Bhbohrium264108Hshassium269109Mtmeitnerium268110Dsdarmstadtium271111Rgroentgenium272112Cncopernicium277113Nhnihonium284114Flflérovium289115Mcmoscovium288116Lvlivermorium292117Tstennessine292118Ogoganesson294
Lanthanides
Actinides
1Hhydrogène1.02Hehélium4.03Lilithium6.94Bebéryllium9.05Bbore10.86Ccarbone12.07Nazote14.08Ooxygène16.09Ffluor19.010Nenéon20.211Nasodium23.012Mgmagnésium24.313Alaluminium27.014Sisilicium28.115Pphosphore31.016Ssoufre32.117Clchlore35.518Arargon39.919Kpotassium39.120Cacalcium40.121Scscandium45.022Tititane47.923Vvanadium50.924Crchrome52.025Mnmanganèse54.926Fefer55.827Cocobalt58.928Ninickel58.729Cucuivre63.530Znzinc65.431Gagallium69.732Gegermanium72.633Asarsenic74.934Sesélénium79.035Brbrome79.936Krkrypton83.837Rbrubidium85.538Srstrontium87.639Yyttrium88.940Zrzirconium91.241Nbniobium92.942Momolybdène95.943Tctechnétium99.044Ruruthénium101.145Rhrhodium102.946Pdpalladium106.447Agargent107.948Cdcadmium112.449Inindium114.850Snétain118.751Sbantimoine121.852Tetellure127.653Iiode126.954Xexénon131.355Cscésium132.956Babaryum137.357Lalanthane138.958Cecérium140.159Prpraséodyme140.960Ndnéodyme144.261Pmprométhium145.062Smsamarium150.463Eueuropium152.064Gdgadolinium157.365Tbterbium158.966Dydysprosium162.567Hoholmium164.968Ererbium167.369Tmthulium168.970Ybytterbium173.071Lulutétium175.072Hfhafnium178.573Tatantale180.974Wtungstène183.975Rerhénium186.276Ososmium190.277Iriridium192.278Ptplatine195.179Auor197.080Hgmercure200.681Tlthallium204.482Pbplomb207.283Bibismuth209.084Popolonium210.085Atastate210.086Rnradon222.087Frfrancium223.088Raradium226.089Acactinium227.090Ththorium232.091Paprotactinium231.092Uuranium238.093Npneptunium237.094Puplutonium242.095Amaméricium243.096Cmcurium247.097Bkberkélium247.098Cfcalifornium251.099Eseinsteinium254.0100Fmfermium253.0101Mdmendélévium256.0102Nonobélium254.0103Lrlawrencium257.0104Rfrutherfordium261105Dbdubnium262106Sgseaborgium266107Bhbohrium264108Hshassium269109Mtmeitnerium268110Dsdarmstadtium271111Rgroentgenium272112Cncopernicium277113Nhnihonium284114Flflérovium289115Mcmoscovium288116Lvlivermorium292117Tstennessine292118Ogoganesson294