0 0.0000 0.00000 0.0 0 0.07 0.50 0.70 1 1.008 1.007825032 13.5984 0.75420375 2.20 Greek 'hydro' and 'gennao' for 'forms water' 0.32 1.2 1.00 1.00 1.00 20.28 14.01 s uk 1766 C. Cavendish 1 1 1s1 Non-Metal 2 4.002602 4.002603254 24.5874 0 The Greek word for the sun was 'helios' 0.46 1.4 0.85 1.00 1.00 4.216 0.95 p se,uk 1895 P. J. Janssen;J. N. Lockyer 1 18 1s2 Noblegas 3 6.94 7.01600455 5.3917 0.618049 0.98 Greek 'lithos' means 'stone' 1.33 2.2 0.80 0.50 1.00 1615 453.7 s se 1817 A. Arfvedson 2 1 He 2s1 Alkali_Earth 4 9.012182 9.0121822 9.3227 0 1.57 Greek 'beryllos' for 'light-green stone' 1.02 1.9 0.76 1.00 0.00 3243 1560 s fr 1797 Nicholas Louis Vauquelin 2 2 He 2s2 Alkaline_Earth 5 10.81 11.0093054 8.2980 0.279723 2.04 Boron means 'Bor(ax) + (carb)on'. It is found in borax and behaves a lot like carbon 0.85 1.8 1.00 0.71 0.71 4275 2365 p uk,fr 1808 Louis Joseph Gay-Lussac;Louis Jacques Thenard 2 13 He 2s2 2p1 Metalloids 6 12.011 12 11.2603 1.262118 2.55 Latin 'carboneum' for carbon 0.75 1.7 0.50 0.50 0.50 5100 3825 p ancient 0 2 14 He 2s2 2p2 Non-Metal 7 14.007 14.003074 14.5341 -0.07 3.04 Latin 'nitrogenium' ('forms saltpeter') 0.71 1.6 0.05 0.05 1.00 77.344 63.15 p uk 1772 D. Rutherford 2 15 He 2s2 2p3 Non-Metal 8 15.999 15.99491462 13.6181 1.4611120 3.44 Latin 'oxygenium' (forms acids) 0.63 1.55 1.00 0.05 0.05 90.188 54.8 p se,uk 1774 J. Priestley 2 16 He 2s2 2p4 Non-Metal 9 18.9984032 18.99840322 17.4228 3.4011887 3.98 Latin 'fluere' ('floats') 0.64 1.5 0.70 1.00 1.00 85 53.55 p fr 1886 H. F. Moissan 2 17 He 2s2 2p5 Halogen 10 20.1797 19.99244018 21.5645 0 Greek 'neo'. meaning 'new' 0.67 1.54 0.70 0.89 0.96 27.1 24.55 p uk 1898 W. Ramsay;M.W. Travers 2 18 He 2s2 2p6 Noblegas 11 22.98976928 22.98976928 5.1391 0.547926 0.93 Arabic 'natrun' for 'soda' 1.55 2.4 0.67 0.36 0.95 1156 371 s uk 1807 Sir Humphrey Davy 3 1 Ne 3s1 Alkali_Earth 12 24.305 23.9850417 7.6462 0 1.31 Named after the city of Magnesia 1.39 2.2 0.54 1.00 0.00 1380 922 s uk 1808 H. B. Davy 3 2 Ne 3s2 Alkaline_Earth 13 26.9815386 26.98153863 5.9858 0.43283 1.61 Latin 'alumen' 1.26 2.1 0.75 0.65 0.65 2740 933.5 p dk 1825 H. Ch. Oersted 3 13 Ne 3s2 3p1 Other_Metal 14 28.085 27.97692653 8.1517 1.389521 1.90 Latin 'silex' 1.16 2.1 0.50 0.60 0.60 2630 1683 p se 1823 J. J. Berzelius 3 14 Ne 3s2 3p2 Metalloids 15 30.973762 30.97376163 10.4867 0.7465 2.19 Greek 'phosphoros' for 'carries light' 1.11 1.95 1.00 0.50 0.00 553 317.3 p de 1669 H. Brandt 3 15 Ne 3s2 3p3 Non-Metal 16 32.06 31.972071 10.3600 2.0771029 2.58 In sanskrit 'sweb' means 'to sleep' 1.03 1.8 1.00 1.00 0.19 717.82 392.2 p ancient 0 3 16 Ne 3s2 3p4 Non-Metal 17 35.45 34.96885268 12.9676 3.612724 3.16 Greek 'chloros' for 'yellow-green' 0.99 1.8 0.12 0.94 0.12 239.18 172.17 p se 1774 C. W. Scheele 3 17 Ne 3s2 3p5 Halogen 18 39.948 39.96238312 15.7596 0 Greek 'aergon' for 'inactive' 0.96 1.88 0.50 0.82 0.89 87.45 83.95 p uk 1894 W. Ramsay;J. Rayleigh 3 18 Ne 3s2 3p6 Noblegas 19 39.0983 38.96370668 4.3407 0.501459 0.82 Arabic 'al qaliy' for potash 1.96 2.8 0.56 0.25 0.83 1033 336.8 s uk 1807 H. B. Davy 4 1 Ar 4s1 Alkali_Earth 20 40.078 39.96259098 6.1132 0.02455 1.00 Latin 'calx' for 'lime' 1.71 2.4 0.24 1.00 0.00 1757 1112 s uk 1808 H. B. Davy 4 2 Ar 4s2 Alkaline_Earth 21 44.955912 44.9559119 6.5615 0.188 1.36 Named because it was found in Scandinavia 1.48 2.3 0.90 0.90 0.90 3109 1814 d se 1879 L. Nilson 4 3 Ar 3d1 4s2 Transition 22 47.867 47.9479463 6.8281 0.084 1.54 The Titans were giants in Greek mythology 1.36 2.15 0.75 0.76 0.78 3560 1935 d uk 1791 W. Gregor 4 4 Ar 3d2 4s2 Transition 23 50.9415 50.9439595 6.7462 0.525 1.63 'Vanadis' is another name for the Nordic goddess Freyja 1.34 2.05 0.65 0.65 0.67 3650 2163 d se 1830 N. Sefström 4 5 Ar 3d3 4s2 Transition 24 51.9961 51.9405075 6.7665 0.67584 1.66 Greek 'chroma' means 'color' 1.22 2.05 0.54 0.60 0.78 2945 2130 d fr 1797 Nicholas Louis Vauquelin 4 6 Ar 3d5 4s1 Transition 25 54.938045 54.9380451 7.4340 0 1.55 It was discovered near a town named Magnesia in black earth. Thus, it was named 'magnesia nigra', or for short, Manganese. 1.19 2.05 0.61 0.48 0.78 2235 1518 d se 1774 C. W. Scheele 4 7 Ar 3d5 4s2 Transition 26 55.845 55.9349375 7.9024 0.151 1.83 Latin 'ferrum' 1.16 2.05 0.50 0.48 0.78 3023 1808 d ancient 0 4 8 Ar 3d6 4s2 Transition 27 58.933195 58.933195 7.8810 0.6633 1.88 Named after the German word 'Kobold' for 'goblin' 1.11 2 0.44 0.48 0.78 3143 1768 d se 1737 G. Brandt 4 9 Ar 3d7 4s2 Transition 28 58.6934 57.9353429 7.6398 1.15716 1.91 'Nickel' was the name of a mountain goblin 1.10 2 0.36 0.48 0.76 3005 1726 d se 1751 A. F. Cronstedt 4 10 Ar 3d8 4s2 Transition 29 63.546 62.9295975 7.7264 1.23578 1.90 Greek 'cuprum' for Cypres 1.12 2 1.00 0.48 0.38 2840 1356.6 d ancient 0 4 11 Ar 3d10 4s1 Transition 30 65.38 63.9291422 9.3942 0 1.65 German 'zinking' for 'rough', because zinc ore is very rough 1.18 2.1 0.49 0.50 0.69 1180 692.73 d de 1746 Andreas Marggraf 4 12 Ar 3d10 4s2 Transition 31 69.723 68.9255736 5.9993 0.41 1.81 'Gallia' is an old name for France 1.24 2.1 0.76 0.56 0.56 2478 302.92 p fr 1875 P. E. Lecoq de Boisbaudran 4 13 Ar 3d10 4s2 4p1 Other_Metal 32 72.630 73.9211778 7.8994 1.232712 2.01 Latin 'germania' is an old name for Germany 1.21 2.1 0.40 0.56 0.56 3107 1211.5 p de 1886 C. A. Winkler 4 14 Ar 3d10 4s2 4p2 Metalloids 33 74.92160 74.9215965 9.7886 0.814 2.18 Greek 'arsenikos' for 'male' or 'bold' 1.21 2.05 0.74 0.50 0.89 876 1090 p ancient 0 4 15 Ar 3d10 4s2 4p3 Metalloids 34 78.96 79.9165213 9.7524 2.02067 2.55 Greek 'selena' for 'moon' 1.16 1.9 1.00 0.63 0.00 958 494 p se 1817 J. J. Berzelius 4 16 Ar 3d10 4s2 4p4 Non-Metal 35 79.904 78.9183371 11.8138 3.3635880 2.96 Greek 'bromos' for 'smells badly' 1.14 1.9 0.65 0.16 0.16 331.85 265.95 p fr 1826 A. J. Balard 4 17 Ar 3d10 4s2 4p5 Halogen 36 83.798 83.911507 13.9996 0 3.00 Greek 'kryptos' for 'hidden' 1.17 2.02 0.36 0.72 0.82 120.85 116 p uk 1898 W. Ramsay;M. W. Travers 4 18 Ar 3d10 4s2 4p6 Noblegas 37 85.4678 84.91178974 4.1771 0.485916 0.82 Latin 'rubidus' for 'dark red' 2.10 2.9 0.44 0.18 0.69 961 312.63 s de 1861 Robert W. Bunsen;Gustav R. Kirchhoff 5 1 Kr 5s1 Alkali_Earth 38 87.62 87.9056121 5.6949 0.05206 0.95 Named after the mineral Strontianit 1.85 2.55 0.00 1.00 0.00 1655 1042 s uk 1790 H. B. Davy 5 2 Kr 5s2 Alkaline_Earth 39 88.90585 88.9058483 6.2173 0.307 1.22 Named after the small town of Ytterby near Stockholm in Sweden. Terbium. Ytterbium and Gadolinium are also named after this town. 1.63 2.4 0.58 1.00 1.00 3611 1795 d fi 1794 Johann Gadolin 5 3 Kr 4d1 5s2 Transition 40 91.224 89.9047044 6.6339 0.426 1.33 Named after the mineral zircon 1.54 2.3 0.58 0.88 0.88 4682 2128 d de 1789 Martin Heinrich Klaproth 5 4 Kr 4d2 5s2 Transition 41 92.90638 92.9063781 6.7589 0.893 1.6 Named after Niobe, the daughter of the Greek god Tantalus. 1.47 2.15 0.45 0.76 0.79 5015 2742 d uk 1801 Ch. Hatchett 5 5 Kr 4d4 Transition 42 95.96 97.9054082 7.0924 0.7472 2.16 This name has Greek roots. It means 'like Platinum' - it was difficult to distinguish Molybdenum from Platinum. 1.38 2.1 0.33 0.71 0.71 4912 2896 d se 1778 C. W. Scheele 5 6 Kr 4d5 5s1 Transition 43 97 97.907216 7.28 0.55 1.9 Greek 'technetos' for artificial 1.28 2.05 0.23 0.62 0.62 4538 2477 d it 1937 C. Perrier;E. G. Segre 5 7 Kr 4d6 5s1 Transition 44 101.07 101.9043493 7.3605 1.04638 2.2 Ruthenia is the old name of Russia 1.25 2.05 0.14 0.56 0.56 4425 2610 d ru 1844 K. Klaus 5 8 Kr 4d7 5s1 Transition 45 102.90550 102.905504 7.4589 1.14289 2.28 Greek 'rhodeos' means 'red like a rose' 1.25 2 0.04 0.49 0.55 3970 2236 d uk 1803 W. Wollaston 5 9 Kr 4d8 5s1 Transition 46 106.42 105.903486 8.3369 0.56214 2.20 Named after the asteroid Pallas 1.20 2.05 0.00 0.41 0.52 3240 1825 d uk 1803 5 10 Kr 4d10 Transition 47 107.8682 106.905097 7.5762 1.30447 1.93 Latin 'argentum' for silver 1.28 2.1 0.88 0.88 1.00 2436 1235.1 d ancient 0 5 11 Kr 4d10 5s1 Transition 48 112.411 113.9033585 8.9938 0 1.69 Greek 'kadmia' ('Galmei' = Zinc carbonate) 1.36 2.2 1.00 0.85 0.56 1040 594.26 d de 1817 F. Stromeyer 5 12 Kr 4d10 5s2 Transition 49 114.818 114.903878 5.7864 0.404 1.78 Named after 'Indigo' because of its blue spectrum 1.42 2.2 0.65 0.46 0.45 2350 429.78 p de 1863 F. Reich;H.T. Richter 5 13 Kr 4d10 5s2 5p1 Other_Metal 50 118.710 119.9021947 7.3439 1.112066 1.96 Latin 'stannum' for tin 1.40 2.25 0.40 0.50 0.50 2876 505.12 p ancient 0 5 14 Kr 4d10 5s2 5p2 Other_Metal 51 121.760 120.9038157 8.6084 1.047401 2.05 Arabic 'anthos ammonos' for 'blossom of the god Ammon' 1.40 2.2 0.62 0.39 0.71 1860 903.91 p ancient 0 5 15 Kr 4d10 5s2 5p3 Metalloids 52 127.60 129.9062244 9.0096 1.970875 2.1 Latin 'tellus' or 'telluris' for 'Planet Earth' 1.36 2.1 0.83 0.48 0.00 1261 722.72 p de 1782 Franz Joseph Muller von Reichstein 5 16 Kr 4d10 5s2 5p4 Metalloids 53 126.90447 126.904473 10.4513 3.059038 2.66 Greek 'ioeides' for 'violet'. 1.33 2.1 0.58 0.00 0.58 457.5 386.7 p fr 1811 Bernard Courtois 5 17 Kr 4d10 5s2 5p5 Halogen 54 131.293 131.9041535 12.1298 0 2.6 Greek 'xenos' for 'foreigner' 1.31 2.16 0.26 0.62 0.69 165.1 161.39 p uk 1898 W. Ramsay;M. W. Travers 5 18 Kr 4d10 5s2 5p6 Noblegas 55 132.9054519 132.9054519 3.8939 0.471626 0.79 Latin 'caesius' for 'heaven blue'. 2.32 3 0.34 0.09 0.56 944 301.54 s de 1860 Robert Wilhelm Bunsen;Gustav Robert Kirchhoff 6 1 Xe 6s1 Alkali_Earth 56 137.327 137.9052472 5.2117 0.14462 0.89 Greek 'barys' for 'heavy' 1.96 2.7 0.00 0.79 0.00 2078 1002 s uk 1808 Humphry Bartholomew Davy 6 2 Xe 6s2 Alkaline_Earth 57 138.90547 138.9063533 5.5769 0.47 1.10 Greek 'lanthanein' for 'hidden'. The Lanthanoids are also called the 'rare earth' elements. 1.80 2.5 0.44 0.83 1.00 3737 1191 f se 1839 K. G. Mosander 6 3 Xe 5d1 6s2 Rare_Earth 58 140.116 139.9054387 5.5387 0.5 1.12 Named after the planetoid Ceres 1.63 2.48 1.00 1.00 0.78 3715 1071 f 1803 Jöns Jacob Berzelius;W. Hisinger;M. Klaproth 6 4 Xe 4f1 5d1 6s2 Rare_Earth 59 140.90765 140.9076528 5.473 0.5 1.13 Greek 'prasinos didymos' for 'green twin' 1.76 2.47 0.85 1.00 0.78 3785 1204 f 1885 Carl F. Auer von Welsbach 6 5 Xe 4f3 6s2 Rare_Earth 60 144.242 141.9077233 5.5250 0.5 1.14 Greek 'neos didymos' for 'new twin' 1.74 2.45 0.78 1.00 0.78 3347 1294 f 1885 Carl F. Auer von Welsbach 6 6 Xe 4f4 6s2 Rare_Earth 61 145 144.912749 5.582 0.5 Named after the Greek Prometheus. Prometheus stole the fire from the gods and gave it to mankind. 1.73 2.43 0.64 1.00 0.78 3273 1315 f 1945 J. A. Marinsky;C. D. Coryell;L. E. Glendenin 6 7 Xe 4f5 6s2 Rare_Earth 62 150.36 151.9197324 5.6437 0.5 1.17 Named after the mineral Samarskit 1.72 2.42 0.56 1.00 0.78 2067 1347 f 1879 P. Lecoq de Boisbaudran 6 8 Xe 4f6 6s2 Rare_Earth 63 151.964 152.9212303 5.6704 0.5 Named after Europe 1.68 2.4 0.38 1.00 0.78 1800 1095 f 1901 E. A. Demarcay 6 8 Xe 4f7 6s2 Rare_Earth 64 157.25 157.9241039 6.1498 0.5 1.20 Named after the Finnish chemist Johan Gadolin 1.69 2.38 0.27 1.00 0.78 3545 1585 f 1880 Jean de Marignac 6 8 Xe 4f7 5d1 6s2 Rare_Earth 65 158.92535 158.9253468 5.8638 0.5 Named after the Swedish town of Ytterby 1.68 2.37 0.19 1.00 0.78 3500 1629 f 1843 K. G. Mosander 6 1 Xe 4f9 6s2 Rare_Earth 66 162.500 163.9291748 5.9389 0.5 1.22 Greek 'dysprositor' for 'difficult to reach' 1.67 2.35 0.12 1.00 0.78 2840 1685 f 1886 F. E. Lecoq de Boisbaudran 6 2 Xe 4f10 6s2 Rare_Earth 67 164.93032 164.9303221 6.0215 0.5 1.23 Latin 'holmia' for the old name of Stockholm 1.66 2.33 0.00 1.00 0.61 2968 1747 f 1878 J. L. Soret;P.T. Cleve 6 3 Xe 4f11 6s2 Rare_Earth 68 167.259 165.9302931 6.1077 0.5 1.24 Named ofter the Swedish town of Ytterby. Terbium and Ytterbium are also named after this town. 1.65 2.32 0.00 0.90 0.46 3140 1802 f 1843 K. G. Mosander 6 4 Xe 4f12 6s2 Rare_Earth 69 168.93421 168.9342133 6.1843 0.5 1.25 Named after the old name of Scandinavia, 'Thule'. 1.64 2.3 0.00 0.83 0.32 2223 1818 f 1879 P. T. Cleve 6 5 Xe 4f13 6s2 Rare_Earth 70 173.054 173.9388621 6.2542 0.5 Like Terbium and Gadolinium, this is named after the Swedish town of Ytterby. 1.70 2.28 0.00 0.75 0.22 1469 1092 f 1878 J. Ch. Marignac 6 6 Xe 4f14 6s2 Rare_Earth 71 174.9668 174.9407718 5.4259 0.5 1.27 Named after the Roman name 'Lutetia' for Paris 1.62 2.27 0.00 0.67 0.14 3668 1936 f 1907 Carl F. Auer von Welsbach;G. Urbain 6 7 Xe 4f14 5d1 6s2 Rare_Earth 72 178.49 179.94655 6.8251 0 1.3 'Hafnia' is the old name of Kopenhagen (Denmark) 1.52 2.25 0.30 0.76 1.00 4875 2504 d dk 1923 D. Coster;G. Hevesy 6 4 Xe 4f14 5d2 6s2 Transition 73 180.94788 180.9479958 7.5496 0.322 1.5 Named after the Greek myth of Tantalos 1.46 2.2 0.30 0.65 1.00 5730 3293 d se 1802 A. Ekeberg 6 5 Xe 4f14 5d3 6s2 Transition 74 183.84 183.9509312 7.8640 0.815 2.36 'tung sten' means 'heavy stone' in Swedish. The old name (and thus the symbol 'W') was Wolfram, named after a mineral. 1.37 2.1 0.13 0.58 0.84 5825 3695 d es 1783 C. W. Scheele 6 6 Xe 4f14 5d4 6s2 Transition 75 186.207 186.9557531 7.8335 0.15 1.9 Named after the German river Rhine (latin 'Rhenium'). 1.31 2.05 0.15 0.49 0.67 5870 3455 d de 1925 Walter Noddack;Ida Tacke-Noddack;Otto Berg 6 7 Xe 4f14 5d5 6s2 Transition 76 190.23 191.9614807 8.4382 1.07780 2.2 Greek for 'smell'. Its oxides smell strongly like radishes. 1.29 2 0.15 0.40 0.59 5300 3300 d uk 1804 S. Tennant 6 8 Xe 4f14 5d6 6s2 Transition 77 192.217 192.9629264 8.9670 1.56436 2.20 Greek 'iris' for 'rainbow' 1.22 2 0.09 0.33 0.53 4700 2720 d uk 1804 S. Tennant 6 9 Xe 4f14 5d7 6s2 Transition 78 195.084 194.9647911 8.9588 2.12510 2.28 Spanish 'platina' means 'small silver' 1.23 2.05 0.96 0.93 0.82 4100 2042.1 d uk 1735 A. de Ulloa 6 10 Xe 4f14 5d9 6s1 Transition 79 196.966569 196.9665687 9.2255 2.30861 2.54 Latin 'aurum'. Named after Aurora, the goddess of sunrise 1.24 2.1 0.80 0.82 0.12 3130 1337.58 d ancient 0 6 11 Xe 4f14 5d10 6s1 Transition 80 200.592 201.970643 10.4375 0 2.00 Graeco-Latin 'hydrargyrum' for 'liquid silver' 1.33 2.05 0.71 0.71 0.76 629.88 234.31 d ancient 0 6 12 Xe 4f14 5d10 6s2 Transition 81 204.38 204.9744275 6.1082 0.377 1.62 Greek 'tallos' for 'young twig' 1.44 2.2 0.65 0.33 0.30 1746 577 p uk 1861 W. Crookes 6 13 Xe 4f14 5d10 6s2 6p1 Other_Metal 82 207.2 207.9766521 7.4167 0.364 2.33 Latin 'plumbum' for Lead 1.44 2.3 0.34 0.35 0.38 2023 600.65 p ancient 0 6 14 Xe 4f14 5d10 6s2 6p2 Other_Metal 83 208.98040 208.9803987 7.2855 0.942363 2.02 The old name of Bismuth is 'Wismut', which stood for 'white mass'. 1.51 2.3 0.62 0.31 0.71 1837 544.59 p ancient 0 6 15 Xe 4f14 5d10 6s2 6p3 Other_Metal 84 209 208.9824304 8.414 1.9 2.0 Named after Poland to honor Marie Curie 1.45 2 0.67 0.36 0.00 527 p fr 1898 M. Sklodowska-Curie;P. Curie 6 16 Xe 4f14 5d10 6s2 6p4 Metalloids 85 210 209.987148 0 2.8 2.2 Greek 'astator' for 'changing' 1.47 2 0.46 0.31 0.27 610 575 p us 1940 D. R. Corson;K. R. McKenzie;E. Segre 6 17 Xe 4f14 5d10 6s2 6p5 Halogen 86 222 222.0175777 10.7485 0 Named after Radium. It ends with 'on' to make it clear that it is a noble gas. 1.42 2 0.26 0.51 0.59 211.4 202 p de 1898 E. Dorn 6 18 Xe 4f14 5d10 6s2 6p6 Noblegas 87 223 223.0197359 4.0727 0.7 Named after France to honor Marguerite Perey 2.23 2 0.26 0.00 0.40 950 300 s fr 1939 M. Perey 7 1 Rn 7s1 Alkali_Earth 88 226 226.0254098 5.2784 0.9 Latin 'radius' for 'beam', as it is radioactive 2.01 2 0.00 0.49 0.00 1413 973 s fr 1898 M. Sklodowska-Curie;P. Curie 7 2 Rn 7s2 Alkaline_Earth 89 227 227.0277521 5.17 1.1 Greek 'aktis' for 'beam' - actinium is radioactive 1.86 2 0.44 0.67 0.98 3470 1324 f fr 1899 A. L. Debierne 7 3 Rn 6d1 7s2 Other_Metal 90 232.03806 232.0380553 6.3067 1.3 Named after the German god of thunder: Thor 1.75 2.4 0.00 0.73 1.00 5060 2028 f 1828 J. J. Berzelius 7 4 Rn 6d2 7s2 Other_Metal 91 231.03588 231.035884 5.89 1.5 Greek 'protos' for 'ancester'. Protactinium is before Actinium in the periodic table. 1.69 2 0.00 0.63 1.00 4300 1845 f 1917 O. Hahn;L. Meitern;W. Wollaston 7 5 Rn 5f2 6d1 7s2 Other_Metal 92 238.02891 238.0507882 6.1941 1.38 Greek 'ouranos' for 'heaven'. Named after the planet Uranus. 1.70 2.3 0.00 0.56 1.00 4407 1408 f 1789 M. M. Klaproth 7 6 Rn 5f3 6d1 7s2 Other_Metal 93 237 237.0481734 6.2657 1.36 Named after the planet Neptune. 1.71 2 0.00 0.50 1.00 4175 912 f 1940 E. M. McMillan;P. Aberson 7 7 Rn 5f4 6d1 7s2 Other_Metal 94 244 244.064204 6.0260 1.28 Named after the planet Pluto. 1.72 2 0.00 0.42 1.00 3505 913 f 1940 Glenn T. Seaborg;E. M. McMillan;J. W. Kennedy;A.C. Wahl 7 8 Rn 5f6 7s2 Other_Metal 95 243 243.0613811 5.9738 1.3 Named after America. 1.66 2 0.33 0.36 0.95 2880 1449 f 1945 Glenn T. Seaborg;L. O. Morgan;R. A. James;A. Ghiors 7 8 Rn 5f7 7s2 Other_Metal 96 247 247.070354 5.9914 1.3 Named after Marie Curie. 1.66 2 0.47 0.36 0.89 3383 1620 f 1944 Glenn T. Seaborg;R. A. James;A. Ghiors 7 8 Rn 5f7 6d1 7s2 Other_Metal 97 247 247.070307 6.1979 1.3 Named after the town Berkeley where it was discovered. 1.68 2 0.54 0.31 0.89 983 1258 f 1949 Glenn T. Seaborg;A. Ghiors;S. G. Thompson 7 1 Rn 5f9 7s2 Other_Metal 98 251 251.079587 6.2817 1.3 Named after the US-State of California. 1.68 2 0.63 0.21 0.83 1173 1172 f 1950 Glenn T. Seaborg;A. Ghiors;S. G. Thompson 7 2 Rn 5f10 7s2 Other_Metal 99 252 252.08298 6.42 1.3 Named after the scientist Albert Einstein. 1.65 2 0.70 0.12 0.83 1130 f 1952 Glenn T. Seaborg;et al. 7 3 Rn 5f11 7s2 Other_Metal 100 257 257.095105 6.50 1.3 Named after the scientist Enrico Fermi. 1.67 2 0.70 0.12 0.73 1800 f 1953 Glenn T. Seaborg;et al. 7 4 Rn 5f12 7s2 Other_Metal 101 258 258.098431 6.58 1.3 Named after the scientist D.I. Mendeleev. 1.73 2 0.70 0.05 0.65 1100 f 1955 Glenn T. Seaborg;Albert Ghiorso;Bernard Harvey;Gregory Choppin;Stanley G. Thompson 7 5 Rn 5f13 7s2 Other_Metal 102 259 259.10103 6.65 1.3 Named after the scientist Alfred Nobel. 1.76 2 0.74 0.05 0.53 1100 f 1958 7 6 Rn 5f14 7s2 Other_Metal 103 262 262.10963 4.9 Named after the scientist Ernest Orlando Lawrence. 1.61 2 0.78 0.00 0.40 1900 f 1961 Albert Ghiorso;Torbjorn Sikkeland;Almon Larsh;Robert M. Latimer 7 7 Rn 5f14 7s2 7p1 Other_Metal 104 267 261.10877 6.0 Named after the scientist Ernest Rutherford 1.57 2 0.80 0.00 0.35 d ru,us 1964 7 4 Rn 5f14 6d2 7s2 Transition 105 270 262.11408 Named after the science-town Dubna in Russia 1.49 2 0.82 0.00 0.31 d ru,us 1967 7 5 Rn 5f14 6d3 7s2 Transition 106 271 263.11832 Named after the scientist G. Theodore Seaborg. 1.43 2 0.85 0.00 0.27 d ru,us 1974 Albert Ghiorso;et al. 7 6 Transition 107 270 264.1246 Named after the scientist Niels Bohr. 1.41 2 0.88 0.00 0.22 d ru 1981 Peter Armbruster;Gottfried Münzenber;et al. 7 7 Transition 108 277 265.13009 Latin 'hassia' for the German county Hessen. In Hessen a lot elements have been discovered. 1.34 2 0.90 0.00 0.18 d de 1984 Peter Armbruster;Gottfried Münzenber;et al. 7 8 Transition 109 276 268.13873 Named after the scientist Lise Meitner. 1.29 2 0.91 0.00 0.15 d de 1982 Peter Armbruster;Gottfried Münzenber;et al. 7 9 Transition 110 281 271.14606 Named after the German city Darmstadt where many elements have been discovered. 1.28 0.92 0.00 0.14 d de 1994 S. Hofmann;V. Ninov;F. P. Hessberger;P. Armbruster;H. Folger;G. Münzenberg;H. J. Schött;et al. 7 10 Transition 111 282 272.15362 Named after Wilhelm Conrad Röntgen. 1.21 0.93 0.00 0.13 d de 1994 S. Hofmann;V. Ninov;F. P. Hessberger;P. Armbruster;H. Folger;G. Münzenberg;et al. 7 11 Transition 112 285 285.17411 Historically known as eka-mercury. Named in honor of the astronomer Nicolaus Copernicus. The temporary IUPAC systematic element name was Ununbium. 1.22 0.94 0.00 0.12 d de 1996 First created at the Gesellschaft für Schwerionenforschung 7 12 Transition 113 285 284.17808 Historically known as eka-thallium. Ununtrium is a temporary IUPAC systematic element name. 1.36 0.95 0.00 0.11 p ru,us 2003 Russian scientists at Dubna (JINR);American scientists at the Lawrence Livermore National Laboratory. 7 13 Other_Metal 114 289 289.18728 Historically known as eka-lead. Named after the Flerov Laboratory of Nuclear Reactions of the Joint Inst. for Nuclear Research (JINR), Russia, where it was discovered. The temporary IUPAC systematic element name was Ununquadium. 1.43 0.96 0.00 0.10 p ru,us 1998 Joint Institute for Nuclear Research 7 14 Other_Metal 115 289 288.19249 Historically known as eka-bismuth. Ununpentium is a temporary IUPAC systematic element name. 1.62 0.97 0.00 0.09 p ru,us 2004 Russian scientists at Dubna (JINR);American scientists at the Lawrence Livermore National Laboratory. 7 15 Other_Metal 116 293 292.19979 Historically known as eka-polonium. The name recognizes the Lawrence Livermore National Laboratory, California, which collaborated with the Joint Inst. for Nuclear Research (JINR), Russia on the discovery. The temporary IUPAC systematic element name was Ununhexium. 1.75 0.98 0.00 0.08 p ru 2000 Joint Institute for Nuclear Research 7 16 Other_Metal 117 294 Temporary symbol and name. Can also be referred to as eka-astatine. 1.65 0.99 0.00 0.07 p 0 7 17 Halogen 118 294 Historically known as eka-radon, eka-emanation before 1960. Ununoctium is a temporary IUPAC systematic element name. 1.57 1.00 0.00 0.06 p ru,us 2002 Russian scientists at Dubna (JINR);American scientists at the Lawrence Livermore National Laboratory. 7 18 Noblegas