H 1.008 Hydrogen Na 22.990 19 Li 6.94 K 39.098 Potassium 37 Rb 85.468 Rubidiun Cs 132.905 Cesium 87 Fr 223.020 4 Be 9.012 Beryllium 12 Mg 24.305 20 Ca 40.00 Calcium 38 Sr 87.62 Strontium 56 Ba 137.328 Barium 88 Ra 226.025 Radium 21 Sc 44.956 Scandium 39 Y 88.906 Yttrium 57-71 Transition Metals Alkaline Earth Metals Alkali Metals Actinides Lanthanides Ti 47.867 Titanium 40 Zr 91.224 Zirconium Hf 178.49 Hafnium 89-103 104 La 138.905 89 23 Ac 227.028 Actinium V 50.942 Vanadium 41 Nb 92.906 Niobium 73 Ta 180.948 Tantalum 105 24 90 Th 232.038 Thorium Cr 51.996 Chromium 42 Post-Transition Metals Metalloids Nonmetals Noble Gases Halogens Mo 95.95 W 183.84 Tungsten 106 Ce Pr 140.116 Cerium The Periodic Table of Elements Rf Db Sg Bh [262] [266] [264] (261) Rutherfordium Dubnium Seaborgium Bohrium 25 Pa 231.036 Mn 54.938 Manganese Tc Ru 98.907 101.07 Technetium Ruthenium 107 76 Re Os 192.217 186.207 Rhenium 60 Nd 140.908 144.242 Praseodymium Neodymium 92 Fe 55.845 Iron 44 238.029 108 28 Co Ni 58.933 Cobalt 61 45 Rh 102