00.00000.000000.000.07 0.50 0.7011.007941.00782503213.59840.754203752.20Greek 'hydro' and 'gennao' for 'forms water'0.371.21.00 1.00 1.0020.2814.01suk1766C. Cavendish111s1Non-Metal24.0026024.00260325424.58740The Greek word for the sun was 'helios'0.321.40.85 1.00 1.004.2160.95pse,uk1895P. J. Janssen;J. N. Lockyer181s2Noblegas36.9417.016004555.39170.6180490.98Greek 'lithos' means 'stone'1.342.20.80 0.50 1.001615453.7sse1817A. Arfvedson21He 2s1Alkali_Earth49.0121829.01218229.322701.57Greek 'beryllos' for 'light-green stone'0.901.90.76 1.00 0.0032431560sfr1797Nicholas Louis Vauquelin22He 2s2Alkaline_Earth510.81111.00930548.29800.2797232.04Boron means 'Bor(ax) + (carb)on'. It is found in borax and behaves a lot like carbon0.821.81.00 0.71 0.7142752365puk,fr1808Louis Joseph Gay-Lussac;Louis Jacques Thenard23He 2s2 2p1Metalloids612.01071211.26031.2621182.55Latin 'carboneum' for carbon0.771.70.50 0.50 0.5051003825pancient024He 2s2 2p2Non-Metal714.006714.00307414.5341-0.073.04Latin 'nitrogenium' ('forms saltpeter')0.751.60.05 0.05 1.0077.34463.15puk1772D. Rutherford25He 2s2 2p3Non-Metal815.999415.9949146213.61811.46111203.44Latin 'oxygenium' (forms acids)0.731.551.00 0.05 0.0590.18854.8pse,uk1774J. Priestley26He 2s2 2p4Non-Metal918.998403218.9984032217.42283.40118873.98Latin 'fluere' ('floats')0.711.50.70 1.00 1.008553.55pfr1886H. F. Moissan27He 2s2 2p5Halogen1020.179719.9924401821.56450Greek 'neo'. meaning 'new'0.691.540.70 0.89 0.9627.124.55puk1898W. Ramsay;M.W. Travers28He 2s2 2p6Noblegas1122.9897692822.989769285.13910.5479260.93Arabic 'natrun' for 'soda'1.542.40.67 0.36 0.951156371suk1807Sir Humphrey Davy31Ne 3s1Alkali_Earth1224.305023.98504177.646201.31Named after the city of Magnesia1.302.20.54 1.00 0.001380922suk1808H. B. Davy32Ne 3s2Alkaline_Earth1326.981538626.981538635.98580.432831.61Latin 'alumen'1.182.10.75 0.65 0.652740933.5pdk1825H. Ch. Oersted33Ne 3s2 3p1Other_Metal1428.085527.976926538.15171.3895211.90Latin 'silex'1.112.10.50 0.60 0.6026301683pse1823J. J. Berzelius34Ne 3s2 3p2Metalloids1530.97376230.9737616310.48670.74652.19Greek 'phosphoros' for 'carries light'1.061.951.00 0.50 0.00553317.3pde1669H. Brandt35Ne 3s2 3p3Non-Metal1632.06531.97207110.36002.07710292.58In sanskrit 'sweb' means 'to sleep'1.021.81.00 1.00 0.19717.82392.2pancient036Ne 3s2 3p4Non-Metal1735.45334.9688526812.96763.6127243.16Greek 'chloros' for 'yellow-green'0.991.80.12 0.94 0.12239.18172.17pse1774C. W. Scheele37Ne 3s2 3p5Halogen1839.94839.9623831215.75960Greek 'aergon' for 'inactive'0.971.880.50 0.82 0.8987.4583.95puk1894W. Ramsay;J. Rayleigh38Ne 3s2 3p6Noblegas1939.098338.963706684.34070.5014590.82Arabic 'al qaliy' for potash1.962.80.56 0.25 0.831033336.8suk1807H. B. Davy41Ar 4s1Alkali_Earth2040.07839.962590986.11320.024551.00Latin 'calx' for 'lime'1.742.40.24 1.00 0.0017571112suk1808H. B. Davy42Ar 4s2Alkaline_Earth2144.95591244.95591196.56150.1881.36Named because it was found in Scandinavia1.442.30.90 0.90 0.9031091814dse1879L. Nilson43Ar 3d1 4s2Transition2247.86747.94794636.82810.0841.54The Titans were giants in Greek mythology1.362.150.75 0.76 0.7835601935duk1791W. Gregor44Ar 3d2 4s2Transition2350.941550.94395956.74620.5251.63'Vanadis' is another name for the Nordic goddess Freyja1.252.050.65 0.65 0.6736502163dse1830N. Sefström45Ar 3d3 4s2Transition2451.996151.94050756.76650.675841.66Greek 'chroma' means 'color'1.272.050.54 0.60 0.7829452130dfr1797Nicholas Louis Vauquelin46Ar 3d5 4s1Transition2554.93804554.93804517.434001.55It was discovered near a town named Magnesia in black earth. Thus, it was named 'magnesia nigra', or for short, Manganese.1.392.050.61 0.48 0.7822351518dse1774C. W. Scheele47Ar 3d5 4s2Transition2655.84555.93493757.90240.1511.83Latin 'ferrum'1.252.050.50 0.48 0.7830231808dancient048Ar 3d6 4s2Transition2758.93319558.9331957.88100.66331.88Named after the German word 'Kobold' for 'goblin'1.2620.44 0.48 0.7831431768dse1737G. Brandt48Ar 3d7 4s2Transition2858.693457.93534297.63981.157161.91'Nickel' was the name of a mountain goblin1.2120.36 0.48 0.7630051726dse1751A. F. Cronstedt48Ar 3d8 4s2Transition2963.54662.92959757.72641.235781.90Greek 'cuprum' for Cypres1.3821.00 0.48 0.3828401356.6dancient041Ar 3d10 4s1Transition3065.3863.92914229.394201.65German 'zinking' for 'rough', because zinc ore is very rough1.312.10.49 0.50 0.691180692.73dde1746Andreas Marggraf42Ar 3d10 4s2Transition3169.72368.92557365.99930.411.81'Gallia' is an old name for France1.262.10.76 0.56 0.562478302.92pfr1875P. E. Lecoq de Boisbaudran43Ar 3d10 4s2 4p1Other_Metal3272.6473.92117787.89941.2327122.01Latin 'germania' is an old name for Germany1.222.10.40 0.56 0.5631071211.5pde1886C. A. Winkler44Ar 3d10 4s2 4p2Metalloids3374.9216074.92159659.78860.8142.18Greek 'arsenikos' for 'male' or 'bold'1.192.050.74 0.50 0.898761090pancient045Ar 3d10 4s2 4p3Metalloids3478.9679.91652139.75242.020672.55Greek 'selena' for 'moon'1.161.91.00 0.63 0.00958494pse1817J. J. Berzelius46Ar 3d10 4s2 4p4Non-Metal3579.90478.918337111.81383.36358802.96Greek 'bromos' for 'smells badly'1.141.90.65 0.16 0.16331.85265.95pfr1826A. J. Balard47Ar 3d10 4s2 4p5Halogen3683.79883.91150713.999603.00Greek 'kryptos' for 'hidden'1.102.020.36 0.72 0.82120.85116puk1898W. Ramsay;M. W. Travers48Ar 3d10 4s2 4p6Noblegas3785.467884.911789744.17710.4859160.82Latin 'rubidus' for 'dark red'2.112.90.44 0.18 0.69961312.63sde1861Robert W. Bunsen;Gustav R. Kirchhoff51Kr 5s1Alkali_Earth3887.6287.90561215.69490.052060.95Named after the mineral Strontianit1.922.550.00 1.00 0.0016551042suk1790H. B. Davy52Kr 5s2Alkaline_Earth3988.9058588.90584836.21730.3071.22Named after the small town of Ytterby near Stockholm in Sweden. Terbium. Ytterbium and Gadolinium are also named after this town.1.622.40.58 1.00 1.0036111795dfi1794Johann Gadolin53Kr 4d1 5s2Transition4091.22489.90470446.63390.4261.33Named after the mineral zircon1.482.30.58 0.88 0.8846822128dde1789Martin Heinrich Klaproth54Kr 4d2 5s2Transition4192.9063892.90637816.75890.8931.6Named after Niobe, the daughter of the Greek god Tantalus.1.372.150.45 0.76 0.7950152742duk1801Ch. Hatchett55Kr 4d4Transition4295.9697.90540827.09240.74722.16This name has Greek roots. It means 'like Platinum' - it was difficult to distinguish Molybdenum from Platinum.1.452.10.33 0.71 0.7149122896dse1778C. W. Scheele56Kr 4d5 5s1Transition439897.9072167.280.551.9Greek 'technetos' for artificial1.562.050.23 0.62 0.6245382477dit1937C. Perrier;E. G. Segre57Kr 4d6 5s1Transition44101.07101.90434937.36051.046382.2Ruthenia is the old name of Russia1.262.050.14 0.56 0.5644252610dru1844K. Klaus58Kr 4d7 5s1Transition45102.90550102.9055047.45891.142892.28Greek 'rhodeos' means 'red like a rose'1.3520.04 0.49 0.5539702236duk1803W. Wollaston58Kr 4d8 5s1Transition46106.42105.9034868.33690.562142.20Named after the asteroid Pallas1.312.050.00 0.41 0.5232401825duk180358Kr 4d10Transition47107.8682106.9050977.57621.304471.93Latin 'argentum' for silver1.532.10.88 0.88 1.0024361235.1dancient051Kr 4d10 5s1Transition48112.411113.90335858.993801.69Greek 'kadmia' ('Galmei' = Zinc carbonate)1.482.21.00 0.85 0.561040594.26dde1817F. Stromeyer52Kr 4d10 5s2Transition49114.818114.9038785.78640.4041.78Named after 'Indigo' because of its blue spectrum1.442.20.65 0.46 0.452350429.78pde1863F. Reich;H.T. Richter53Kr 4d10 5s2 5p1Other_Metal50118.710119.90219477.34391.1120661.96Latin 'stannum' for tin1.412.250.40 0.50 0.502876505.12pancient054Kr 4d10 5s2 5p2Other_Metal51121.760120.90381578.60841.0474012.05Arabic 'anthos ammonos' for 'blossom of the god Ammon'1.382.20.62 0.39 0.711860903.91pancient055Kr 4d10 5s2 5p3Metalloids52127.60129.90622449.00961.9708752.1Latin 'tellus' or 'telluris' for 'Planet Earth'1.352.10.83 0.48 0.001261722.72pde1782Franz Joseph Muller von Reichstein56Kr 4d10 5s2 5p4Metalloids53126.90447126.90447310.45133.0590382.66Greek 'ioeides' for 'violet'.1.332.10.58 0.00 0.58457.5386.7pfr1811Bernard Courtois57Kr 4d10 5s2 5p5Halogen54131.293131.904153512.129802.6Greek 'xenos' for 'foreigner'1.302.160.26 0.62 0.69165.1161.39puk1898W. Ramsay;M. W. Travers58Kr 4d10 5s2 5p6Noblegas55132.9054519132.90545193.89390.4716260.79Latin 'caesius' for 'heaven blue'.2.2530.34 0.09 0.56944301.54sde1860Robert Wilhelm Bunsen;Gustav Robert Kirchhoff61Xe 6s1Alkali_Earth56137.327137.90524725.21170.144620.89Greek 'barys' for 'heavy'1.982.70.00 0.79 0.0020781002suk1808Humphry Bartholomew Davy62Xe 6s2Alkaline_Earth57138.90547138.90635335.57690.471.10Greek 'lanthanein' for 'hidden'. The Lanthanoids are also called the 'rare earth' elements.1.692.50.44 0.83 1.0037371191fse1839K. G. Mosander63Xe 5d1 6s2Rare_Earth58140.116139.90543875.53870.51.12Named after the planetoid Ceres2.481.00 1.00 0.7837151071f1803Jöns Jacob Berzelius;W. Hisinger;M. Klaproth64Xe 4f1 5d1 6s2Rare_Earth59140.90765140.90765285.4730.51.13Greek 'prasinos didymos' for 'green twin'2.470.85 1.00 0.7837851204f1885Carl F. Auer von Welsbach65Xe 4f3 6s2Rare_Earth60144.242141.90772335.52500.51.14Greek 'neos didymos' for 'new twin'2.450.78 1.00 0.7833471294f1885Carl F. Auer von Welsbach66Xe 4f4 6s2Rare_Earth61145144.9127495.5820.5Named after the Greek Prometheus. Prometheus stole the fire from the gods and gave it to mankind.2.430.64 1.00 0.7832731315f1945J. A. Marinsky;C. D. Coryell;L. E. Glendenin67Xe 4f5 6s2Rare_Earth62150.36151.91973245.64370.51.17Named after the mineral Samarskit2.420.56 1.00 0.7820671347f1879P. Lecoq de Boisbaudran68Xe 4f6 6s2Rare_Earth63151.964152.92123035.67040.5Named after Europe2.40.38 1.00 0.7818001095f1901E. A. Demarcay68Xe 4f7 6s2Rare_Earth64157.25157.92410396.14980.51.20Named after the Finnish chemist Johan Gadolin2.380.27 1.00 0.7835451585f1880Jean de Marignac68Xe 4f7 5d1 6s2Rare_Earth65158.92535158.92534685.86380.5Named after the Swedish town of Ytterby2.370.19 1.00 0.7835001629f1843K. G. Mosander61Xe 4f9 6s2Rare_Earth66162.500163.92917485.93890.51.22Greek 'dysprositor' for 'difficult to reach'2.350.12 1.00 0.7828401685f1886F. E. Lecoq de Boisbaudran62Xe 4f10 6s2Rare_Earth67164.93032164.93032216.02150.51.23Latin 'holmia' for the old name of Stockholm2.330.00 1.00 0.6129681747f1878J. L. Soret;P.T. Cleve63Xe 4f11 6s2Rare_Earth68167.259165.93029316.10770.51.24Named ofter the Swedish town of Ytterby. Terbium and Ytterbium are also named after this town.2.320.00 0.90 0.4631401802f1843K. G. Mosander64Xe 4f12 6s2Rare_Earth69168.93421168.93421336.18430.51.25Named after the old name of Scandinavia, 'Thule'.2.30.00 0.83 0.3222231818f1879P. T. Cleve65Xe 4f13 6s2Rare_Earth70173.054173.93886216.25420.5Like Terbium and Gadolinium, this is named after the Swedish town of Ytterby.2.280.00 0.75 0.2214691092f1878J. Ch. Marignac66Xe 4f14 6s2Rare_Earth71174.9668174.94077185.42590.51.27Named after the Roman name 'Lutetia' for Paris1.602.270.00 0.67 0.1436681936f1907Carl F. Auer von Welsbach;G. Urbain67Xe 4f14 5d1 6s2Rare_Earth72178.49179.946556.825101.3'Hafnia' is the old name of Kopenhagen (Denmark)1.502.250.30 0.76 1.0048752504ddk1923D. Coster;G. Hevesy64Xe 4f14 5d2 6s2Transition73180.94788180.94799587.54960.3221.5Named after the Greek myth of Tantalos1.382.20.30 0.65 1.0057303293dse1802A. Ekeberg65Xe 4f14 5d3 6s2Transition74183.84183.95093127.86400.8152.36'tung sten' means 'heavy stone' in Swedish. The old name (and thus the symbol 'W') was Wolfram, named after a mineral.1.462.10.13 0.58 0.8458253695des1783C. W. Scheele66Xe 4f14 5d4 6s2Transition75186.207186.95575317.83350.151.9Named after the German river Rhine (latin 'Rhenium').1.592.050.15 0.49 0.6758703455dde1925Walter Noddack;Ida Tacke-Noddack;Otto Berg67Xe 4f14 5d5 6s2Transition76190.23191.96148078.43821.077802.2Greek for 'smell'. Its oxides smell strongly like radishes.1.2820.15 0.40 0.5953003300duk1804S. Tennant68Xe 4f14 5d6 6s2Transition77192.217192.96292648.96701.564362.20Greek 'iris' for 'rainbow'1.3720.09 0.33 0.5347002720duk1804S. Tennant68Xe 4f14 5d7 6s2Transition78195.084194.96479118.95882.125102.28Spanish 'platina' means 'small silver'1.282.050.96 0.93 0.8241002042.1duk1735A. de Ulloa68Xe 4f14 5d9 6s1Transition79196.966569196.96656879.22552.308612.54Latin 'aurum'. Named after Aurora, the goddess of sunrise1.442.10.80 0.82 0.1231301337.58dancient061Xe 4f14 5d10 6s1Transition80200.59201.97064310.437502.00Graeco-Latin 'hydrargyrum' for 'liquid silver'1.492.050.71 0.71 0.76629.88234.31dancient062Xe 4f14 5d10 6s2Transition81204.3833204.97442756.10820.3771.62Greek 'tallos' for 'young twig'1.482.20.65 0.33 0.301746577puk1861W. Crookes63Xe 4f14 5d10 6s2 6p1Other_Metal82207.2207.97665217.41670.3642.33Latin 'plumbum' for Lead1.472.30.34 0.35 0.382023600.65pancient064Xe 4f14 5d10 6s2 6p2Other_Metal83208.98040208.98039877.28550.9423632.02The old name of Bismuth is 'Wismut', which stood for 'white mass'.1.462.30.62 0.31 0.711837544.59pancient065Xe 4f14 5d10 6s2 6p3Other_Metal84209208.98243048.4141.92.0Named after Poland to honor Marie Curie20.67 0.36 0.00527pfr1898M. Sklodowska-Curie;P. Curie66Xe 4f14 5d10 6s2 6p4Metalloids85210209.98714802.82.2Greek 'astator' for 'changing'20.46 0.31 0.27610575pus1940D. R. Corson;K. R. McKenzie;E. Segre67Xe 4f14 5d10 6s2 6p5Halogen86222222.017577710.74850Named after Radium. It ends with 'on' to make it clear that it is a noble gas.1.4520.26 0.51 0.59211.4202pde1898E. Dorn68Xe 4f14 5d10 6s2 6p6Noblegas87223223.01973594.07270.7Named after France to honor Marguerite Perey20.26 0.00 0.40950300sfr1939M. Perey71Rn 7s1Alkali_Earth88226226.02540985.27840.9Latin 'radius' for 'beam', as it is radioactive20.00 0.49 0.001413973sfr1898M. Sklodowska-Curie;P. Curie72Rn 7s2Alkaline_Earth89227227.02775215.171.1Greek 'aktis' for 'beam' - actinium is radioactive20.44 0.67 0.9834701324ffr1899A. L. Debierne73Rn 6d1 7s2Other_Metal90232.03806232.03805536.30671.3Named after the German god of thunder: Thor2.40.00 0.73 1.0050602028f1828J. J. Berzelius74Rn 6d2 7s2Other_Metal91231.03588231.0358845.891.5Greek 'protos' for 'ancester'. Protactinium is before Actinium in the periodic table.20.00 0.63 1.0043001845f1917O. Hahn;L. Meitern;W. Wollaston75Rn 5f2 6d1 7s2Other_Metal92238.02891238.05078826.19411.38Greek 'ouranos' for 'heaven'. Named after the planet Uranus.2.30.00 0.56 1.0044071408f1789M. M. Klaproth76Rn 5f3 6d1 7s2Other_Metal93237237.04817346.26571.36Named after the planet Neptune.20.00 0.50 1.004175912f1940E. M. McMillan;P. Aberson77Rn 5f4 6d1 7s2Other_Metal94244244.0642046.02601.28Named after the planet Pluto.20.00 0.42 1.003505913f1940Glenn T. Seaborg;E. M. McMillan;J. W. Kennedy;A.C. Wahl78Rn 5f6 7s2Other_Metal95243243.06138115.97381.3Named after America.20.33 0.36 0.9528801449f1945Glenn T. Seaborg;L. O. Morgan;R. A. James;A. Ghiors78Rn 5f7 7s2Other_Metal96247247.0703545.99141.3Named after Marie Curie.20.47 0.36 0.8933831620f1944Glenn T. Seaborg;R. A. James;A. Ghiors78Rn 5f7 6d1 7s2Other_Metal97247247.0703076.19791.3Named after the town Berkeley where it was discovered.20.54 0.31 0.899831258f1949Glenn T. Seaborg;A. Ghiors;S. G. Thompson71Rn 5f9 7s2Other_Metal98251251.0795876.28171.3Named after the US-State of California.20.63 0.21 0.8311731172f1950Glenn T. Seaborg;A. Ghiors;S. G. Thompson72Rn 5f10 7s2Other_Metal99252252.082986.421.3Named after the scientist Albert Einstein.20.70 0.12 0.831130f1952Glenn T. Seaborg;et al.73Rn 5f11 7s2Other_Metal100257257.0951056.501.3Named after the scientist Enrico Fermi.20.70 0.12 0.731800f1953Glenn T. Seaborg;et al.74Rn 5f12 7s2Other_Metal101258258.0984316.581.3Named after the scientist D.I. Mendeleev.20.70 0.05 0.651100f1955Glenn T. Seaborg;Albert Ghiorso;Bernard Harvey;Gregory Choppin;Stanley G. Thompson75Rn 5f13 7s2Other_Metal102259259.101036.651.3Named after the scientist Alfred Nobel.20.74 0.05 0.531100f195876Rn 5f14 7s2Other_Metal103262262.109634.9Named after the scientist Ernest Orlando Lawrence.20.78 0.00 0.401900f1961Albert Ghiorso;Torbjorn Sikkeland;Almon Larsh;Robert M. Latimer77Rn 5f14 7s2 7p1Other_Metal104267261.108776.0Named after the scientist Ernest Rutherford20.80 0.00 0.35dru,us196474Rn 5f14 6d2 7s2Transition105268262.11408Named after the science-town Dubna in Russia20.82 0.00 0.31dru,us196775Rn 5f14 6d3 7s2Transition106271263.11832Named after the scientist G. Theodore Seaborg.20.85 0.00 0.27dru,us1974Albert Ghiorso;et al.76Transition107272264.1246Named after the scientist Niels Bohr.20.88 0.00 0.22dru1981Peter Armbruster;Gottfried Münzenber;et al.77Transition108270265.13009Latin 'hassia' for the German county Hessen. In Hessen a lot elements have been discovered.20.90 0.00 0.18dde1984Peter Armbruster;Gottfried Münzenber;et al.78Transition109276268.13873Named after the scientist Lise Meitner.20.91 0.00 0.15dde1982Peter Armbruster;Gottfried Münzenber;et al.78Transition110281271.14606Named after the German city Darmstadt where many elements have been discovered.0.92 0.00 0.14dde1994S. Hofmann;V. Ninov;F. P. Hessberger;P. Armbruster;H. Folger;G. Münzenberg;H. J. Schött;et al.78Transition111280272.15362Named after Wilhelm Conrad Röntgen.0.93 0.00 0.13dde1994S. Hofmann;V. Ninov;F. P. Hessberger;P. Armbruster;H. Folger;G. Münzenberg;et al.71Transition112285285.17411Historically known as eka-mercury. Ununbium is a temporary IUPAC systematic element name.0.94 0.00 0.12dde1996First created at the Gesellschaft für Schwerionenforschung7Transition113284284.17808Historically known as eka-thallium. Ununtrium is a temporary IUPAC systematic element name.0.95 0.00 0.11pru,us2003Russian scientists at Dubna (JINR);American scientists at the Lawrence Livermore National Laboratory.7Other_Metal114289289.18728Historically known as eka-lead. Ununquadium is a temporary IUPAC systematic element name.0.96 0.00 0.10pru,us1998Joint Institute for Nuclear Research7Other_Metal115288288.19249Historically known as eka-bismuth. Ununpentium is a temporary IUPAC systematic element name.0.97 0.00 0.09pru,us2004Russian scientists at Dubna (JINR);American scientists at the Lawrence Livermore National Laboratory.7Other_Metal116293292.19979Historically known as eka-polonium. Ununhexium is a temporary IUPAC systematic element name.0.98 0.00 0.08pru2000Joint Institute for Nuclear Research7Other_Metal117Temporary symbol and name. Can also be referred to as eka-astatine.0.99 0.00 0.07p07Halogen118294Historically known as eka-radon, eka-emanation before 1960. Ununoctium is a temporary IUPAC systematic element name.1.00 0.00 0.06pru,us2002Russian scientists at Dubna (JINR);American scientists at the Lawrence Livermore National Laboratory.7Noblegas