CHARACTERISTICS OF ATOMS DOE-HDBK-1015/1-93 Fundamentals of Chemistry CH-01 Rev. 0 Page 6 TABLE 2 (Cont.) Table of Elements Name and Symbol Number Weight Name Number Weight Atomic Atomic Atomic Atomic (amu) (amu) Lead Pb   82 207.19 Potassium K    19 39.102 Lithium Li   3 6.939 Praseodymium Pr 59 140.90 Lutetium Lu   71 174.97 Protactinium Pa   91 231.03 Magnesium Mg 12 24.312 Promethium Pm 61 (145) Manganese Mn 25 54.938 Radium Ra   88 226.02 Mendelevium Md 101 (258) Radon Rn   86 (222) Mercury Hg 80 200.59 Rhenium Re 75 186.2 Molybdenum Mo 42 95.94 Rhodium Rh   45 102.90 Neodymium Nd 60 144.24 Rubidium Rb   37 85.47 Neon Ne 10 20.183 Ruthenium Ru   44 101.07 Neptunium Np 93 237.05 Samarium Sm 62 150.35 Nickel Ni 28 58.71 Scandium Sc   21 44.956 Niobium Nb 41 92.906 Selenium Se   34 78.96 Nitrogen N 7 14.006 Silicon Si   34 78.96 Nobelium No 102 (259) Silver Ag   47 107.87 Osmium Os 76 190.2 Sodium Na   11 22.989 Oxygen O 8 15.999 Strontium Sr   38 87.62 Palladium Pd 46 106.41 Sulfur S    16 32.064 Phosphorus   P 15 30.973 Tantalum Ta   73 180.94 Platinum Pt 78 195.09 Technetium Tc   43 (98) Plutonium Pu 94 (244) Tellurium Te   52 127.60 Polonium Po   84 (209) Terbium Tb   65 158.92