.12 66.5 59 Pr Praseodymium the Greek praseios didymos meaning 'green twin' 6 140.90766(2) 6.773 1208 3793 0.193 1.13 9.2 60 Nd Neodymium the Greek neos didymos meaning 'new twin' 6 144.242(3) 7.007 1297 3347 0.19 1.14 41.5 61 Pm Promethium Prometheus of Greek mythology who stole fire from the Gods and gave it to humans 6 [145] 7.26 1315 3273 – 1.13 2×10 −19 62 Sm Samarium Samarskite , the name of the mineral from which it was first isolated 6 150.36(2) 7.52 1345 2067 0.197 1.17 7.05 63 Eu Europium Europe 6 151.964(1) 5.243 1099 1802 0.182 1.2 2 64 Gd Gadolinium Johan Gadolin , chemist, physicist and mineralogist 6 157.25(3) 7.895 1585 3546 0.236 1.2 6.2 65 Tb Terbium Ytterby , Sweden 6 158.92535(2) 8.229 1629 3503 0.182 1.2 1.2 66 Dy Dysprosium the Greek dysprositos , 'hard to get' 6 162.500(1) 8.55 1680 2840 0.17 1.22 5.2 67 Ho Holmium Holmia , the New Latin name for Stockholm 6 164.93033(2) 8.795 1734 2993 0.165 1.23 1.3 68 Er Erbium Ytterby , Sweden 6 167.259(3) 9.066 1802 3141 0.168 1.24 3.5 69 Tm Thulium Thule , the ancient name for Scandinavia 6 168.93422(2) 9.321 1818 2223 0.16 1.25 0.52 70 Yb Ytterbium Ytterby , Sweden 6 173.045(10) 6.965 1097 1469 0.155 1.1 3.2 71 Lu Lutetium Lutetia , the Latin name for Paris 6 174.9668(1) 9.84 1925 3675 0.154 1.27 0.8 72 Hf Hafnium Hafnia , the New Latin name for Copenhagen 4 6 178.49(2) 13.31 2506 4876 0.144 1.3 3 73 Ta Tantalum King Tantalus , father of Niobe from Greek mythology 5 6 180.94788(2) 16.654 3290 5731 0.14 1.5 2 74 W Tungsten the Swedish tung sten , 'heavy stone' (W is wolfram , the old name of the tungsten mineral wolframite) 6 6 183.84(1) 19.25 3695 5828 0.132 2.36 1.3 75 Re Rhenium Rhenus , the Latin name for the river Rhine 7 6 186.207(1) 21.02 3459 5869 0.137 1.9 7×10 −4 76 Os Osmium the Greek osmè , meaning 'smell' 8 6 190.23(3) 22.61 3306 5285 0.13 2.2 0.002 77 Ir Iridium Iris , the Greek goddess of the rainbow 9 6 192.217(3) 22.56 2719 4701 0.131 2.2 0.001 78 Pt Platinum the Spanish platina , meaning 'little silver' 10 6 195.084(9) 21.46 2041.4 4098 0.133 2.28 0.005 79 Au Gold English word ( aurum in Latin) 11 6 196.966569(5) 19.282 1337.33 3129 0.129 2.54 0.004 80 Hg Mercury the New Latin name mercurius , named after the Roman god (Hg from former name hydrargyrum , from Greek hydr- , 'water', and argyros , 'silver') 12 6 200.592(3) 13.5336 234.43 629.88 0.14 2 0.085 81 Tl Thallium the Greek thallos , 'green twig' 13 6 204.38 11.85 577 1746 0.129 1.62 0.85 82 Pb Lead English word ( plumbum in Latin) 14 6 207.2(1) 11.342 600.61 2022 0.129 1.87 14 83 Bi Bismuth German word, now obsolete 15 6 208.98040(1) 9.807 544.7 1837 0.122 2.02 0.009 84 Po Polonium Named after the home country of Marie Curie ( Poland ), who is also the discoverer of Radium 16 6 [209] 9.32 527 1235 – 2.0 2×10 −10 85 At Astatine the Greek astatos , 'unstable' 17 6 [210] 7 575 610 – 2.2 3×10 −20 86 Rn Radon From radium , as it was first detected as an emission from radium during radioactive decay 18 6 [222] 0.00973 202 211.3 0.094 2.2 4×10 −13 87 Fr Francium Francia , the New Latin name for France 1 7 [223] 1.87 300 950 – 0.7 ~ 1×10 −18 88 Ra Radium the Latin radius , 'ray' 2 7 [226] 5.5 973 2010 0.094 0.9 9×10 −7 89 Ac Actinium the Greek aktis , 'ray' 3 7 [227] 10.07 1323 3471 0.12 1.1 5.5×10 −10 90 Th Thorium Thor , the Scandinavian god of thunder 7 232.0377(4) 11.72 2115 5061 0.113 1.3 9.6 91 Pa Protactinium the Greek protos , 'first', and actinium , which is produced through the radioactive decay of protactinium 7 231.03588(2) 15.37 1841 4300 – 1.5 1.4×10 −6 92 U Uranium Uranus , the seventh planet in the Solar System 7 238.02891(3) 18.95 1405.3 4404 0.116 1.38 2.7 93 Np Neptunium Neptune , the eighth planet in the Solar System 7 [237] 20.45 917 4273 – 1.36 ≤ 3×10 −12 94 Pu Plutonium Pluto , a dwarf planet in the Solar System (then considered the ninth planet) 7 [244] 19.84 912.5 3501 – 1.28 ≤ 3×10 −11 95 Am Americium The Americas , as the element was first synthesized on the continent, by analogy with europium 7 [243] 13.69 1449 2880 – 1.13 0 96 Cm Curium Pierre Curie , a physicist, and Marie Curie , a physicist and chemist, named after great scientists by analogy with gadolinium 7 [247] 13.51 1613 3383 – 1.28 0 97 Bk Berkelium Berkeley, California , where the element was first synthesized, by analogy with terbium 7 [247] 14.79 1259 2900 – 1.3 0 98 Cf Californium California , where the element was first synthesized 7 [251] 15.1 1173 (1743) – 1.3 0 99 Es Einsteinium Albert Einstein , physicist 7 [252] 8.84 1133 (1269) – 1.3 0 100 Fm Fermium Enrico Fermi , physicist 7 [257] (9.7) (1125) – – 1.3 0 101 Md Mendelevium Dmitri Mendeleev , chemist and inventor 7 [258] (10.3) (1100) – – 1.3 0 102 No Nobelium Alfred Nobel , chemist, engineer, innovator, and armaments manufacturer 7 [259] (9.9) (1100) – – 1.3 0 103 Lr Lawrencium Ernest O. Lawrence , physicist 7 [266] (15.6) (1900) – – 1.3 0 104 Rf Rutherfordium Ernest Rutherford , chemist and physicist 4 7 [267] (23.2) (2400) (5800) – – 0 105 Db Dubnium Dubna , Russia 5 7 [268] (29.3) – – – – 0 106 Sg Seaborgium Glenn T. Seaborg , scientist 6 7 [269] (35.0) – – – – 0 107 Bh Bohrium Niels Bohr , physicist 7 7 [270] (37.1) – – – – 0 108 Hs Hassium Hesse , Germany, where the element was first synthesized 8 7 [277] (40.7) – – – – 0 109 Mt Meitnerium Lise Meitner , physicist 9 7 [278] (37.4) – – – – 0 110 Ds Darmstadtium Darmstadt , Germany, where the element was first synthesized 10 7 [281] (34.8) – – – – 0 111 Rg Roentgenium Wilhelm Conrad Röntgen , physicist 11 7 [282] (28.7) – – – – 0 112 Cn Copernicium Nicolaus Copernicus , astronomer 12 7 [285] (23.7) – 357 – – 0 113 Nh Nihonium the Japanese name for Japan , Nihon , where the element was first synthesized 13 7 [286] (16) (700) (1400) – – 0 114 Fl Flerovium Flerov Laboratory of Nuclear Reactions , part of JINR where the element was synthesized; itself named for Georgy Flyorov , physicist 14 7 [289] (14) – ~210 – – 0 115 Mc Moscovium Moscow Oblast , Russia, where the element was first synthesized 15 7 [290] (13.5) (700) (1400) – – 0 116 Lv Livermorium Lawrence Livermore National Laboratory (in Livermore, California ) which collaborated with JINR on its synthesis 16 7 [293] (12.9) (709) (1085) – – 0 117 Ts Tennessine Tennessee , United States 17 7 [294] (7.2) (723) (883) – – 0 118 Og Oganesson Yuri Oganessian , physicist 18 7 [294] (5.0) – (350) – – 0