1 H Hydrogen nonmetal 1 H Hydrogen nonmetal Atomic Number Symbol Name Chemical Group Block Display Property/Trend Chemical Group Block PubChem 2 He Helium noble gas 3 Li Lithium alkali metal 4 Be Beryllium alkaline earth metal 5 B Boron metalloid 6 C Carbon nonmetal 7 N Nitrogen nonmetal 8 O Oxygen nonmetal 9 F Fluorine halogen 10 Ne Neon noble gas 11 Na Sodium alkali metal 12 Mg Magnesium alkaline earth metal 13 Al Aluminum post-transition metal 14 Si Silicon metalloid 15 P Phosphorus nonmetal 16 S Sulfur nonmetal 17 Cl Chlorine halogen 18 Ar Argon noble gas 19 K Potassium alkali metal 20 Ca Calcium alkaline earth metal 21 Sc Scandium transition metal 22 Ti Titanium transition metal 23 V Vanadium transition metal 24 Cr Chromium transition metal 25 Mn Manganese transition metal 26 Fe Iron transition metal 27 Co Cobalt transition metal 28 Ni Nickel transition metal 29 Cu Copper transition metal 30 Zn Zinc transition metal 31 Ga Gallium post-transition metal 32 Ge Germanium metalloid 33 As Arsenic metalloid 34 Se Selenium nonmetal 35 Br Bromine halogen 36 Kr Krypton noble gas 37 Rb Rubidium alkali metal 38 Sr Strontium alkaline earth metal 39 Y Yttrium transition metal 40 Zr Zirconium transition metal 41 Nb Niobium transition metal 42 Mo Molybdenum transition metal 43 Tc Technetium transition metal 44 Ru Ruthenium transition metal 45 Rh Rhodium transition metal 46 Pd Palladium transition metal 47 Ag Silver transition metal 48 Cd Cadmium transition metal 49 In Indium post-transition metal 50 Sn Tin post-transition metal 51 Sb Antimony metalloid 52 Te Tellurium metalloid 53 I Iodine halogen 54 Xe Xenon noble gas 55 Cs Cesium alkali metal 56 Ba Barium alkaline earth metal * 72 Hf Hafnium transition metal 73 Ta Tantalum transition metal 74 W Tungsten transition metal 75 Re Rhenium transition metal 76 Os Osmium transition metal 77 Ir Iridium transition metal 78 Pt Platinum transition metal 79 Au Gold transition metal 80 Hg Mercury transition metal 81 Tl Thallium post-transition metal 82 Pb Lead post-transition metal 83 Bi Bismuth post-transition metal 84 Po Polonium metalloid 85 At Astatine halogen 86 Rn Radon noble gas 87 Fr Francium alkali metal 88 Ra Radium alkaline earth metal ** 104 Rf Rutherfordium transition metal 105 Db Dubnium transition metal 106 Sg Seaborgium transition metal 107 Bh Bohrium transition metal 108 Hs Hassium transition metal 109 Mt Meitnerium transition metal 110 Ds Darmstadtium transition metal 111 Rg Roentgenium transition metal 112 Cn Copernicium transition metal 113 Nh Nihonium post-transition metal 114 Fl Flerovium post-transition metal 115 Mc Moscovium post-transition metal 116 Lv Livermorium post-transition metal 117 Ts Tennessine halogen 118 Og Oganesson noble gas * 57 La Lanthanum lanthanide 58 Ce Cerium lanthanide 59 Pr Praseodymium lanthanide 60 Nd Neodymium lanthanide 61 Pm Promethium lanthanide 62 Sm Samarium lanthanide 63 Eu Europium lanthanide 64 Gd Gadolinium lanthanide 65 Tb Terbium lanthanide 66 Dy Dysprosium lanthanide 67 Ho Holmium lanthanide 68 Er Erbium lanthanide 69 Tm Thulium lanthanide 70 Yb Ytterbium lanthanide 71 Lu Lutetium lanthanide ** 89 Ac Actinium actinide 90 Th Thorium actinide 91 Pa Protactinium actinide 92 U Uranium actinide 93 Np Neptunium actinide 94 Pu Plutonium actinide 95 Am Americium actinide 96 Cm Curium actinide 97 Bk Berkelium actinide 98 Cf Californium actinide 99 Es Einsteinium actinide 100 Fm Fermium actinide 101 Md Mendelevium actinide 102 No Nobelium actinide 103 Lr Lawrencium actinide