PERIODIC TABLE Revised 1995 ATOMIC ATOMIC PLACE OF DISCOVERY NAME SYMBOL WEIGHT NUMBER AND DATE Actinium Ac (227) 9 France, 1899 Algobarium AB (305) 115 Alien Aluminum Al 26.9815 13 Denmark, 1825 Americum Am (243) 95 USA, 1945 Antimony Sb 121.75 51 Known to Ancients on Earth Argon Ar 39.948 18 Scotland, 1894 Arsenic As 74.9216 33 Known to Ancients on Earth Astatine At (210) 85 USA, 1940 Barium Ba 137.34 56 England, 1808 Berkelium Bk (247) 97 USA, 1949 Beryllium Be 9.0122 4 Germany/france, 1828 Bismuth Ri 208.9804 83 Known to Ancients on Earth Boridium Bo (317) 121 Alien Boron B 10.811 5 France/England, 1808 Bromine Br 79.909 35 France, 1826 Cadmium Cd 112.40 48 Germany, 1817 Calcium Ca 40.08 20 England, 1808 Californium Cf (251) 98 USA, 1950 Carhcn C 12.01115 6 Known to Ancients on Earth Celebium Cb (299) 113 Alien Cerium Ce 140.12 58 Sweden/Gennany, 1803 Cesium Cs 132.9054 55 Germany, 1860 Chlorine Cl 35.453 17 Sweden, 1774 Chromium Cr 51.996 24 France, 1797 Cobalt Co 58.9332 27 Sweden 1737 Colladium Ci (302) 114 USA, 1977 Copper Cu 63.546 29 Known to Ancients on Earth Corbomite Ct (361) 140 Alien Curium Cm (247) 96 USA, 1944 Diburnium Db (319) 122 Alien Dikironium Dk (300) 112 Alien Dilithium Dd (315) 119 Alien Dysprosium Dy 162.50 66 France, 1886 Note: Numbers in parentheses indicate the mass number with the most stable isotope, (good enough to our civilization at the moment). Einsteinium Es (254) 99 USA, 1952 Element 106 (263) 106 USA/Russia, 1974 Element 107 (280) 107 USA/Russia, 1977 Element 108 (288) 108 USA/Germany, 1979 Element 109 (296) 109 USA/India, 1982 Element 110 (296) 110 USA/India, 1983 Erbium Er 167.26 68 Sweden, 1843 Europium Eu 151.96 63 France, 1901 Fermium Fm (257) 100 USA, 1953 Fluoride F 18.9984 9 France, 1886 Francium Fr (223) 87 France, 1939 Gadolinium Gd 157.25 64 Switzerland, 1880 Gallium Ga 69.72 31 France, 1875 Germanium Ge 72.59 32 Germany, 1886 Gold Au 196.967 79 Known to Ancients on Earth Hafnium Hf 178.49 72 Denmark, 1923 Halnium Ha (260) 105 USA, 1970 Helium He 4.0026 2 Scotland/Sweden, 1895 Holmium Ho 164.9304 67 Switzerland, 1878 Hydrogen H 1.00797 1 England, 1766 Indium In 114.82 49 Germany, 1863 Indurite It (322) 124 Alien Iodine I 126.9044 53 France, 1811 Iridium Ir 192.22 77 England/France, 1804 Irilium Im (305) 116 Alien Iron Fe 55.847 26 Known to Ancients on Earth Kironide Ki (348) 139 Alien Kripton Kr 83.80 36 Great Britain, 1898 Kurchatovium Ku (260) 104 Russia, 1964 Lanthanum La 138.91 57 Sweden, 1839 Lawrencium Lr (257) 103 USA, 1961 Lead Pb 207.19 82 Known to Ancients on Earth Lithium Li 6.939 3 Sweden, 1817 Lutatium Lu 174.97 71 France, 1807 Note: Numbers in parentheses indicate the mass number with the most stable isotope, (good enough to our civilization at the moment). Magnesium Mg 24.312 12 England, 1808 Manganese Mn 54.9380 23 Sweden, 1774 Mercury Hg 200.59 80 Known to Ancients on Earth Molybdenum Mo 95.94 42 Sweden, 1778 Murinite Mu (320) 123 Alien Md (258) 101 Neodymium Nd 144.24 60 Austria, 1885 Neon Ne 20.183 10 England, 1898 Neptunium Np (237) 93 USA, 1940 Nickel Ni 58.71 28 Sweden, 1751 Niobium No 92.906 41 England, 1801 Nitrogen N 14.0067 7 Scotland, 1772 Nobelium No (259) 102 Sweden, 1957 Osmium Os 190.2 76 England, 1804 Oxygen 0 15.9994 8 England/Sweden, 1774 Palladium Pd 106.4 46 England, 1803 Perglum Pe (292) 111 Alien Phosphorus P 30.9738 15 Germany, 1669 Platinum Pt 195.09 78 Italy, 1557 Plutonium Pu (244) 94 USA, 1940 Polonium Po (209) 84 France, 1898 Potassium K 39.102 19 England, 1807 Praseodymium Pr 140.9077 59 Austria, 1885 Promethium Pm (145) 61 USA, 1945 Protactinium Pa (231) 91 Germany/England, 1917 Radium Ra (226) 88 France, 1898 Radon Rn (222) 86 Germany, 1900 Rhenium Re 186.207 75 Germany, 1925 Rhodium Rh 102.9055 45 England, 1803 Rodinim Ro (333) 125 Alien Rubidium Rh 85.47 37 Germany, 1861 Rubindium Rd (314) 120 Alien Ruthenium Ru 101.07 44 Russia, 1844 Samarium Sm 150.35 62 France, 1879 Scandium Sc 44.956 21 Sweden, 1879 Selenium Se 78.96 34 Sweden, 1817 Silicon Si 28.086 14 Sweden, 1823 Silver Ag 107.870 47 Known to Ancients on Earth Sodium Na 22.9898 11 England, 1807 Strontium Sr 87.62 38 Scotland, 1790 Sulfur S 32.064 16 Known to Ancients on Earth Tantalum Ta 180.948 73 Sweden, 1802 Technetium Tc (97) 43 Italy, 1937 Tellurium Te 127.60 52 Romania, 1782 Terbium Th 158.9254 65 Sweden, 1843 Thallium Tl 204.37 81 England, 1861 Thorium Th 232.0381 90 Sweden, 1828 Thulium Tm 168.9342 69 Sweden, 1879 Tin Sn 118.69 50 Known to Ancients on Earth Titanium Ti 47.90 22 England, 1791 Topaline To (306) 117 Alien Tri-cobalt Tr (332) 129 Alien Tri-Tanium Tn (323) 126 Alien Tri-Titanium Tt (328) 128 Alien Tri-Uium Tv (328) 127 Alien Tungsten W 183.85 74 Spain, 1783 Uranium U 238.029 92 Germany, 1789 Vanadium V 50.942 23 Sweden, 1830 Xenon Xe 131.30 54 England, 1898 Ytterbium Yb 173.04 70 Switzerland, 1878 Yttrium Y 88.9059 39 Finland, 1794 Zienite Zi (318) 118 Alien Zinc Zn 65.37 30 Germany, 1746 Zirconium Zr 91.22 40 Spain, 1789 Note: Numbers in parentheses indicate the mass number with the most stable isotope, (good enough to our civilization at the moment). Zr 91.22 40 Spain, 1789 Note: Numbers in parentheses indicate the mass number with the most stable isotope, (good enough to our civilization at the moment).