ATOMIC WEIGTS ATOMIC NUMBERS

 Atomic numbers and weights.

Element name     Abbreviation     Atomic number       Atomic weight*

Actinium                                     Ac                     89                            227

Aluminum                                   Al                     13                              27

Americium**                              Am                   95                             243

Antimony                                     Sb                    51                             121

Argon                                           Ar                    18                               40

Arsenic                                         As                    33                               75

Astatine                                        At                     85                             210

Barium                                         Ba                     56                             138

Berkelium**                                Bk                     97                             247

Beryllium                                     Be                       4                                 9

Bismuth                                        Bi                      83                             209

Boron                                            B                        5                               11

Bromine                                        Br                      35                               79

Cadmium                                     Cd                      48                             114

Calcium                                        Ca                      20                               40

Californium**                              Cf                       98                             251

Carbon                                           C                        6                               12

Cerium                                          Ce                      58                              140

Cesium                                          Cs                      55                               133

Chlorine                                        Cl                       17                                 35

Chromium                                    Cr                       24                                52

Cobalt                                           Co                      27                                59

Copper                                         Cu                      29                                63

Curium**                                    Cm                     96                              247

 Dysprosium                                Dy                      66                             164

 Einsteinium**                            Es                     99                              254

 Erbium                                       Er                      68                              166

 Europium                                   Eu                     63                               153

 Fermium                                    Fm                   100                              257

 Fluorine                                      F                         9                                 19

Francium                                    Fr                      87                                223

Gadolinium                                Gd                     64                                158

 Gallium                                      Ga                     31                                  69

Germanium                                Ge                     32                                 74

 Gold                                            Au                     79                                 197

 Hafnium                                      Hf                      72                                 180

 Helium                                         He                        2                                   4

Holmium                                      Ho                     67                                  165

Hydrogen                                       H                        1                                    1

Indium                                           In                       49                                 115

Iodine                                              I                        53                                127

Iridium                                          Ir                        77                                193

Iron                                                Fe                       26                                 56

Krypton                                         Kr                       36                                 84

Lanthanum                                   La                      57                                139

Lawrencium**                              Lr or Lw            103                              257