atomicNumber 89 atomicWeight 227 discoveryYear 1899 A.D. group 3 horizPos 4 name Actinium period 7 radioactive True state Solid symbol Ac vertPos 10 atomicNumber 13 atomicWeight 26.981538 discoveryYear 1825 A.D. group 13 horizPos 13 name Aluminum period 3 radioactive False state Solid symbol Al vertPos 3 atomicNumber 95 atomicWeight 243 discoveryYear 1944 A.D. group 3 horizPos 10 name Americium period 7 radioactive True state Artificial symbol Am vertPos 10 atomicNumber 51 atomicWeight 121.760 discoveryYear Ancient group 15 horizPos 15 name Antimony period 5 radioactive False state Solid symbol Sb vertPos 5 atomicNumber 18 atomicWeight 39.948 discoveryYear 1894 A.D. group 18 horizPos 18 name Argon period 3 radioactive False state Gas symbol Ar vertPos 3 atomicNumber 33 atomicWeight 74.92160 discoveryYear 1250 A.D. group 15 horizPos 15 name Arsenic period 4 radioactive False state Solid symbol As vertPos 4 atomicNumber 85 atomicWeight 210 discoveryYear 1940 A.D. group 17 horizPos 17 name Astatine period 6 radioactive True state Solid symbol At vertPos 6 atomicNumber 56 atomicWeight 137.327 discoveryYear 1808 A.D. group 2 horizPos 2 name Barium period 6 radioactive False state Solid symbol Ba vertPos 6 atomicNumber 97 atomicWeight 247 discoveryYear 1949 A.D. group 3 horizPos 12 name Berkelium period 7 radioactive True state Artificial symbol Bk vertPos 10 atomicNumber 4 atomicWeight 9.012182 discoveryYear 1797 A.D. group 2 horizPos 2 name Beryllium period 2 radioactive False state Solid symbol Be vertPos 2 atomicNumber 83 atomicWeight 208.98038 discoveryYear 1400 A.D. group 15 horizPos 15 name Bismuth period 6 radioactive False state Solid symbol Bi vertPos 6 atomicNumber 107 atomicWeight 264 discoveryYear 1981 A.D. group 7 horizPos 7 name Bohrium period 7 radioactive True state Artificial symbol Bh vertPos 7 atomicNumber 5 atomicWeight 10.811 discoveryYear 1808 A.D. group 13 horizPos 13 name Boron period 2 radioactive False state Solid symbol B vertPos 2 atomicNumber 35 atomicWeight 79.904 discoveryYear 1826 A.D. group 17 horizPos 17 name Bromine period 4 radioactive False state Liquid symbol Br vertPos 4 atomicNumber 48 atomicWeight 112.411 discoveryYear 1817 A.D. group 12 horizPos 12 name Cadmium period 5 radioactive False state Solid symbol Cd vertPos 5 atomicNumber 20 atomicWeight 40.078 discoveryYear 1808 A.D. group 2 horizPos 2 name Calcium period 4 radioactive False state Solid symbol Ca vertPos 4 atomicNumber 98 atomicWeight 251 discoveryYear 1950 A.D. group 3 horizPos 13 name Californium period 7 radioactive True state Artificial symbol Cf vertPos 10 atomicNumber 6 atomicWeight 12.0107 discoveryYear Prehistoric group 14 horizPos 14 name Carbon period 2 radioactive False state Solid symbol C vertPos 2 atomicNumber 58 atomicWeight 140.116 discoveryYear 1803 A.D. group 3 horizPos 5 name Cerium period 6 radioactive False state Solid symbol Ce vertPos 9 atomicNumber 55 atomicWeight 132.90545 discoveryYear 1860 A.D. group 1 horizPos 1 name Cesium period 6 radioactive False state Solid symbol Cs vertPos 6 atomicNumber 17 atomicWeight 35.453 discoveryYear 1774 A.D. group 17 horizPos 17 name Chlorine period 3 radioactive False state Gas symbol Cl vertPos 3 atomicNumber 24 atomicWeight 51.9961 discoveryYear 1797 A.D. group 6 horizPos 6 name Chromium period 4 radioactive False state Solid symbol Cr vertPos 4 atomicNumber 27 atomicWeight 58.9332 discoveryYear 1735 A.D. group 9 horizPos 9 name Cobalt period 4 radioactive False state Solid symbol Co vertPos 4 atomicNumber 29 atomicWeight 63.546 discoveryYear Prehistoric group 11 horizPos 11 name Copper period 4 radioactive False state Solid symbol Cu vertPos 4 atomicNumber 96 atomicWeight 247 discoveryYear 1944 A.D. group 3 horizPos 11 name Curium period 7 radioactive True state Artificial symbol Cm vertPos 10 atomicNumber 105 atomicWeight 262 discoveryYear 1967 A.D. group 5 horizPos 5 name Dubnium period 7 radioactive True state Artificial symbol Db vertPos 7 atomicNumber 66 atomicWeight 162.5 discoveryYear 1886 A.D. group 3 horizPos 13 name Dysprosium period 6 radioactive False state Solid symbol Dy vertPos 9 atomicNumber 99 atomicWeight 252 discoveryYear 1952 A.D. group 3 horizPos 14 name Einsteinium period 7 radioactive True state Artificial symbol Es vertPos 10 atomicNumber 68 atomicWeight 167.259 discoveryYear 1842 A.D. group 3 horizPos 15 name Erbium period 6 radioactive False state Solid symbol Er vertPos 9 atomicNumber 63 atomicWeight 151.964 discoveryYear 1901 A.D. group 3 horizPos 10 name Europium period 6 radioactive False state Solid symbol Eu vertPos 9 atomicNumber 100 atomicWeight 257 discoveryYear 1952 A.D. group 3 horizPos 15 name Fermium period 7 radioactive True state Artificial symbol Fm vertPos 10 atomicNumber 9 atomicWeight 18.9984032 discoveryYear 1886 A.D. group 17 horizPos 17 name Fluorine period 2 radioactive False state Gas symbol F vertPos 2 atomicNumber 87 atomicWeight 223 discoveryYear 1939 A.D. group 1 horizPos 1 name Francium period 7 radioactive True state Solid symbol Fr vertPos 7 atomicNumber 64 atomicWeight 157.25 discoveryYear 1880 A.D. group 3 horizPos 11 name Gadolinium period 6 radioactive False state Solid symbol Gd vertPos 9 atomicNumber 31 atomicWeight 69.723 discoveryYear 1875 A.D. group 13 horizPos 13 name Gallium period 4 radioactive False state Solid symbol Ga vertPos 4 atomicNumber 32 atomicWeight 72.64 discoveryYear 1886 A.D. group 14 horizPos 14 name Germanium period 4 radioactive False state Solid symbol Ge vertPos 4 atomicNumber 79 atomicWeight 196.96655 discoveryYear Ancient group 11 horizPos 11 name Gold period 6 radioactive False state Solid symbol Au vertPos 6 atomicNumber 72 atomicWeight 178.49 discoveryYear 1923 A.D. group 4 horizPos 4 name Hafnium period 6 radioactive False state Solid symbol Hf vertPos 6 atomicNumber 108 atomicWeight 277 discoveryYear 1984 A.D. group 8 horizPos 8 name Hassium period 7 radioactive True state Artificial symbol Hs vertPos 7 atomicNumber 2 atomicWeight 4.002602 discoveryYear 1895 A.D. group 18 horizPos 18 name Helium period 1 radioactive False state Gas symbol He vertPos 1 atomicNumber 67 atomicWeight 164.93032 discoveryYear 1878 A.D. group 3 horizPos 14 name Holmium period 6 radioactive False state Solid symbol Ho vertPos 9 atomicNumber 1 atomicWeight 1.00794 discoveryYear 1766 A.D. group 1 horizPos 1 name Hydrogen period 1 radioactive False state Gas symbol H vertPos 1 atomicNumber 49 atomicWeight 114.818 discoveryYear 1863 A.D. group 13 horizPos 13 name Indium period 5 radioactive False state Solid symbol In vertPos 5 atomicNumber 53 atomicWeight 126.90447 discoveryYear 1811 A.D. group 17 horizPos 17 name Iodine period 5 radioactive False state Solid symbol I vertPos 5 atomicNumber 77 atomicWeight 192.217 discoveryYear 1803 A.D. group 9 horizPos 9 name Iridium period 6 radioactive False state Solid symbol Ir vertPos 6 atomicNumber 26 atomicWeight 55.845 discoveryYear Prehistoric group 8 horizPos 8 name Iron period 4 radioactive False state Solid symbol Fe vertPos 4 atomicNumber 36 atomicWeight 83.798 discoveryYear 1898 A.D. group 18 horizPos 18 name Krypton period 4 radioactive False state Gas symbol Kr vertPos 4 atomicNumber 57 atomicWeight 138.9055 discoveryYear 1839 A.D. group 3 horizPos 4 name Lanthanum period 6 radioactive False state Solid symbol La vertPos 9 atomicNumber 103 atomicWeight 262 discoveryYear 1961 A.D. group 3 horizPos 18 name Lawrencium period 7 radioactive True state Artificial symbol Lr vertPos 10 atomicNumber 82 atomicWeight 207.2 discoveryYear Ancient group 14 horizPos 14 name Lead period 6 radioactive False state Solid symbol Pb vertPos 6 atomicNumber 3 atomicWeight 6.941 discoveryYear 1817 A.D. group 1 horizPos 1 name Lithium period 2 radioactive False state Solid symbol Li vertPos 2 atomicNumber 71 atomicWeight 174.967 discoveryYear 1907 A.D. group 3 horizPos 18 name Lutetium period 6 radioactive False state Solid symbol Lu vertPos 9 atomicNumber 12 atomicWeight 24.3050 discoveryYear 1755 A.D. group 2 horizPos 2 name Magnesium period 3 radioactive False state Solid symbol Mg vertPos 3 atomicNumber 25 atomicWeight 54.938049 discoveryYear 1774 A.D. group 7 horizPos 7 name Manganese period 4 radioactive False state Solid symbol Mn vertPos 4 atomicNumber 109 atomicWeight 268 discoveryYear 1982 A.D. group 9 horizPos 9 name Meitnerium period 7 radioactive True state Artificial symbol Mt vertPos 7 atomicNumber 101 atomicWeight 258 discoveryYear 1955 A.D. group 3 horizPos 16 name Mendelevium period 7 radioactive True state Artificial symbol Md vertPos 10 atomicNumber 80 atomicWeight 200.59 discoveryYear Ancient group 12 horizPos 12 name Mercury period 6 radioactive False state Liquid symbol Hg vertPos 6 atomicNumber 42 atomicWeight 95.94 discoveryYear 1781 A.D. group 6 horizPos 6 name Molybdenum period 5 radioactive False state Solid symbol Mo vertPos 5 atomicNumber 60 atomicWeight 144.24 discoveryYear 1885 A.D. group 3 horizPos 7 name Neodymium period 6 radioactive False state Solid symbol Nd vertPos 9 atomicNumber 10 atomicWeight 20.1797 discoveryYear 1898 A.D. group 18 horizPos 18 name Neon period 2 radioactive False state Gas symbol Ne vertPos 2 atomicNumber 93 atomicWeight 237 discoveryYear 1940 A.D. group 3 horizPos 8 name Neptunium period 7 radioactive True state Artificial symbol Np vertPos 10 atomicNumber 28 atomicWeight 58.6934 discoveryYear 1751 A.D. group 10 horizPos 10 name Nickel period 4 radioactive False state Solid symbol Ni vertPos 4 atomicNumber 41 atomicWeight 92.90638 discoveryYear 1801 A.D. group 5 horizPos 5 name Niobium period 5 radioactive False state Solid symbol Nb vertPos 5 atomicNumber 7 atomicWeight 14.0067 discoveryYear 1772 A.D. group 15 horizPos 15 name Nitrogen period 2 radioactive False state Gas symbol N vertPos 2 atomicNumber 102 atomicWeight 259 discoveryYear 1958 A.D. group 3 horizPos 17 name Nobelium period 7 radioactive True state Artificial symbol No vertPos 10 atomicNumber 76 atomicWeight 190.23 discoveryYear 1803 A.D. group 8 horizPos 8 name Osmium period 6 radioactive False state Solid symbol Os vertPos 6 atomicNumber 8 atomicWeight 15.9994 discoveryYear 1774 A.D. group 16 horizPos 16 name Oxygen period 2 radioactive False state Gas symbol O vertPos 2 atomicNumber 46 atomicWeight 106.42 discoveryYear 1803 A.D. group 10 horizPos 10 name Palladium period 5 radioactive False state Solid symbol Pd vertPos 5 atomicNumber 15 atomicWeight 30.973761 discoveryYear 1669 A.D. group 15 horizPos 15 name Phosphorus period 3 radioactive False state Solid symbol P vertPos 3 atomicNumber 78 atomicWeight 195.078 discoveryYear 1735 A.D. group 10 horizPos 10 name Platinum period 6 radioactive False state Solid symbol Pt vertPos 6 atomicNumber 94 atomicWeight 244 discoveryYear 1940 A.D. group 3 horizPos 9 name Plutonium period 7 radioactive True state Artificial symbol Pu vertPos 10 atomicNumber 84 atomicWeight 209 discoveryYear 1898 A.D. group 16 horizPos 16 name Polonium period 6 radioactive True state Solid symbol Po vertPos 6 atomicNumber 19 atomicWeight 39.0983 discoveryYear 1807 A.D. group 1 horizPos 1 name Potassium period 4 radioactive False state Solid symbol K vertPos 4 atomicNumber 59 atomicWeight 140.90765 discoveryYear 1885 A.D. group 3 horizPos 6 name Praseodymium period 6 radioactive False state Solid symbol Pr vertPos 9 atomicNumber 61 atomicWeight 145 discoveryYear 1945 A.D. group 3 horizPos 8 name Promethium period 6 radioactive True state Artificial symbol Pm vertPos 9 atomicNumber 91 atomicWeight 231.03588 discoveryYear 1913 A.D. group 3 horizPos 6 name Protactinium period 7 radioactive True state Solid symbol Pa vertPos 10 atomicNumber 88 atomicWeight 226 discoveryYear 1898 A.D. group 2 horizPos 2 name Radium period 7 radioactive True state Solid symbol Ra vertPos 7 atomicNumber 86 atomicWeight 222 discoveryYear 1900 A.D. group 18 horizPos 18 name Radon period 6 radioactive True state Gas symbol Rn vertPos 6 atomicNumber 75 atomicWeight 186.207 discoveryYear 1925 A.D. group 7 horizPos 7 name Rhenium period 6 radioactive False state Solid symbol Re vertPos 6 atomicNumber 45 atomicWeight 102.90550 discoveryYear 1803 A.D. group 9 horizPos 9 name Rhodium period 5 radioactive False state Solid symbol Rh vertPos 5 atomicNumber 37 atomicWeight 85.4678 discoveryYear 1861 A.D. group 1 horizPos 1 name Rubidium period 5 radioactive False state Solid symbol Rb vertPos 5 atomicNumber 44 atomicWeight 101.07 discoveryYear 1844 A.D. group 8 horizPos 8 name Ruthenium period 5 radioactive False state Solid symbol Ru vertPos 5 atomicNumber 104 atomicWeight 261 discoveryYear 1964 A.D. group 4 horizPos 4 name Rutherfordium period 7 radioactive True state Artificial symbol Rf vertPos 7 atomicNumber 62 atomicWeight 150.36 discoveryYear 1879 A.D. group 3 horizPos 9 name Samarium period 6 radioactive False state Solid symbol Sm vertPos 9 atomicNumber 21 atomicWeight 44.955910 discoveryYear 1879 A.D. group 3 horizPos 3 name Scandium period 4 radioactive False state Solid symbol Sc vertPos 4 atomicNumber 106 atomicWeight 266 discoveryYear 1974 A.D. group 6 horizPos 6 name Seaborgium period 7 radioactive True state Artificial symbol Sg vertPos 7 atomicNumber 34 atomicWeight 78.96 discoveryYear 1817 A.D. group 16 horizPos 16 name Selenium period 4 radioactive False state Solid symbol Se vertPos 4 atomicNumber 14 atomicWeight 28.0855 discoveryYear 1824 A.D. group 14 horizPos 14 name Silicon period 3 radioactive False state Solid symbol Si vertPos 3 atomicNumber 47 atomicWeight 107.8682 discoveryYear Ancient group 11 horizPos 11 name Silver period 5 radioactive False state Solid symbol Ag vertPos 5 atomicNumber 11 atomicWeight 22.989770 discoveryYear 1807 A.D. group 1 horizPos 1 name Sodium period 3 radioactive False state Solid symbol Na vertPos 3 atomicNumber 38 atomicWeight 87.62 discoveryYear 1790 A.D. group 2 horizPos 2 name Strontium period 5 radioactive False state Solid symbol Sr vertPos 5 atomicNumber 16 atomicWeight 32.065 discoveryYear Ancient group 16 horizPos 16 name Sulfur period 3 radioactive False state Solid symbol S vertPos 3 atomicNumber 73 atomicWeight 180.9479 discoveryYear 1802 A.D. group 5 horizPos 5 name Tantalum period 6 radioactive False state Solid symbol Ta vertPos 6 atomicNumber 43 atomicWeight 98 discoveryYear 1937 A.D. group 7 horizPos 7 name Technetium period 5 radioactive True state Artificial symbol Tc vertPos 5 atomicNumber 52 atomicWeight 127.60 discoveryYear 1783 A.D. group 16 horizPos 16 name Tellurium period 5 radioactive False state Solid symbol Te vertPos 5 atomicNumber 65 atomicWeight 158.92534 discoveryYear 1843 A.D. group 3 horizPos 12 name Terbium period 6 radioactive False state Solid symbol Tb vertPos 9 atomicNumber 81 atomicWeight 204.3833 discoveryYear 1861 A.D. group 13 horizPos 13 name Thallium period 6 radioactive False state Solid symbol Tl vertPos 6 atomicNumber 90 atomicWeight 232.0381 discoveryYear 1829 A.D. group 3 horizPos 5 name Thorium period 7 radioactive True state Solid symbol Th vertPos 10 atomicNumber 69 atomicWeight 168.93421 discoveryYear 1879 A.D. group 3 horizPos 16 name Thulium period 6 radioactive False state Solid symbol Tm vertPos 9 atomicNumber 50 atomicWeight 118.710 discoveryYear Ancient group 14 horizPos 14 name Tin period 5 radioactive False state Solid symbol Sn vertPos 5 atomicNumber 22 atomicWeight 47.867 discoveryYear 1791 A.D. group 4 horizPos 4 name Titanium period 4 radioactive False state Solid symbol Ti vertPos 4 atomicNumber 74 atomicWeight 183.84 discoveryYear 1783 A.D. group 6 horizPos 6 name Tungsten period 6 radioactive False state Solid symbol W vertPos 6 atomicNumber 112 atomicWeight 285 discoveryYear 1996 A.D. group 12 horizPos 12 name Ununbium period 7 radioactive True state Artificial symbol Uub vertPos 7 atomicNumber 116 atomicWeight 292 discoveryYear 2000 A.D. group 16 horizPos 16 name Ununhexium period 7 radioactive True state Artificial symbol Uuh vertPos 7 atomicNumber 110 atomicWeight 281 discoveryYear 1994 A.D. group 10 horizPos 10 name Ununnilium period 7 radioactive True state Artificial symbol Uun vertPos 7 atomicNumber 118 atomicWeight 294 discoveryYear 2006 A.D. group 18 horizPos 18 name Ununoctium period 7 radioactive True state Artificial symbol Uuo vertPos 7 atomicNumber 115 atomicWeight 288 discoveryYear 2004 A.D. group 15 horizPos 15 name Ununpentium period 7 radioactive True state Artificial symbol Uup vertPos 7 atomicNumber 114 atomicWeight 289 discoveryYear 1998 A.D. group 14 horizPos 14 name Ununquadium period 7 radioactive True state Artificial symbol Uuq vertPos 7 atomicNumber 117 atomicWeight [Unknown] discoveryYear [Undiscovered] group 17 horizPos 17 name Ununseptium period 7 radioactive True state Artificial symbol Uus vertPos 7 atomicNumber 113 atomicWeight 284 discoveryYear 2004 A.D. group 13 horizPos 13 name Ununtrium period 7 radioactive True state Artificial symbol Uut vertPos 7 atomicNumber 111 atomicWeight 272 discoveryYear 1994 A.D. group 11 horizPos 11 name Unununium period 7 radioactive True state Artificial symbol Uuu vertPos 7 atomicNumber 92 atomicWeight 238.02891 discoveryYear 1789 A.D. group 3 horizPos 7 name Uranium period 7 radioactive True state Solid symbol U vertPos 10 atomicNumber 23 atomicWeight 50.9415 discoveryYear 1801 A.D. group 5 horizPos 5 name Vanadium period 4 radioactive False state Solid symbol V vertPos 4 atomicNumber 54 atomicWeight 131.293 discoveryYear 1898 A.D. group 18 horizPos 18 name Xenon period 5 radioactive False state Gas symbol Xe vertPos 5 atomicNumber 70 atomicWeight 173.04 discoveryYear 1878 A.D. group 3 horizPos 17 name Ytterbium period 6 radioactive False state Solid symbol Yb vertPos 9 atomicNumber 39 atomicWeight 88.90585 discoveryYear 1794 A.D. group 3 horizPos 3 name Yttrium period 5 radioactive False state Solid symbol Y vertPos 5 atomicNumber 30 atomicWeight 65.409 discoveryYear 1500 A.D. group 12 horizPos 12 name Zinc period 4 radioactive False state Solid symbol Zn vertPos 4 atomicNumber 40 atomicWeight 91.224 discoveryYear 1789 A.D. group 4 horizPos 4 name Zirconium period 5 radioactive False state Solid symbol Zr vertPos 5