Where X represents the symbol for the element;A represent the mass number i,e;(neutrons+proton). z represents the atomic number ( i,e the number of protons) ;C repesent the charge, if any
1) from questions ,
no of proton =atomic no=12
And no of electrons=10
So the symbol of the ion is Mg2+
2)from questions,
No of proton=atomic no=26
And no of electrons is 23
So the symbol of the ion is Fe3+
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