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Oxygen                                         16


               Fluorine                                       19

               Sodium                                         23


               Magnesium                                      24

               Aluminium                                      27


               Silicon                                        28.

               Phosphorus                                     31


               Sulphur                                        32

               Chlorine                                       35.5


               Potassium                                      39


               Calcium                                        40











































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