Mg has Z=12.find its no. of electrons. How do you calculate mass no. ?
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Explanation:
no of electrons = atomic number (Z) = 12
mass number = atomic number + no of protons
Generally mass no is double the number of proton for even numbers as of magnesium is 24 and oxygen is 16 and in odd cases one is more as of sodium is 23 , except some comes like of Nitrogen is 14
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