Page 2 - 3. LESSON NOTES-(ATOMIC AND RELATIVE ATOMIC MASSES)
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Sodium                                         23


               Magnesium                                      24

               Aluminium                                      27


               Silicon                                        28.

               Phosphorus                                     31


               Sulphur                                        32

               Chlorine                                       35.5


               Potassium                                      39

               Calcium                                        40

























































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