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  1. Write the electronic configuration of calcium (atomic number 20) and magnesium (atomic number 12)
    1. Calcium  
    2. Magnesium     
  2. Why is calcium more reactive than magnesium? 

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  1.  
    1. 2, 8, 8, 2
    2. 2, 8, 2  
  2. The two valency electrons of calcium are further away from the nucleus, therefore not strongly held hence readily lost/donated
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