Periodic table of elements GROUP 1 2 3 4 5 6 7 8 PERIOD 1 1.008 1 H Hydrogen 2 6.94 3 Li Lithium 9.012 4 Be Beryllium 3 22.99 11 Na Sodium 24.31 12 Mg Magnesium 4 39.10 19 K Potassium 40.08 20 Ca Calcium 44.96 21 Sc Scandium 47.87 22 Ti Titanium 50.94 23 V Vanadium 52.00 24 Cr Chromium 54.94 25 Mn Manganese 55.85 26 Fe Iron 5 85.47 37 Rb Rubidium 87.62 38 Sr Strontium 88.91 39 Y Yttrium 91.22 40 Zr Zirconium 92.91 41 Nb Niobium 95.95 42 Mo Molybdenum ( 97) 43 Tc Technetium 101.1 44 Ru Ruthenium 6 132.9 55 Cs Caesium 137.3 56 Ba Barium 57-71 Lanthanoids 178.5 72 Hf Hafnium 180.9 73 Ta Tantalum 183.8 74 W Tungsten 186.2 75 Re Rhenium 190.2 76 Os Osmium 7 (223) 87 Fr Francium (226) 88 Ra Radium 89-103 Actinoids (267) 104 Rf Rutherfordium (270) 105 Db Dubnium (269) 106 Sg Seaborgium (270) 107 Bh Bohrium (269) 108 Hs Hassium 40.08 20 Ca Calcium Atomic mass (u) Symbol (synthetic elements, such as Tc, are represented by white letters) Name Atomic number Although it is on the left-hand side of the periodic table, hydrogen is not a metal. 6 138.9 57 La Lanthanum 140.1 58 Ce Cerium 140.9 59 Pr Praseodymium 144.2 60 Nd Neodymium (145) 61 Pm Promethium 150.4 62 Sm Samarium 7 (227) 89 Ac Actinium 232.0 90 Th Thorium 231.0 91 Pa Protactinium 238.0 92 U Uranium (237) 93 Np Neptunium (244) 94 Pu Plutonium Lanthanoids Actinoids 302
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