Atom A has 4 electrons less compared to ion B2*. The last valence electron of ion B2+ is located at 2p subshell which is fully filled with electrons. Ion C2 is isoelectronic with ion B2+. (i) Determine the number of protons of atom A, ion B2+ and ion C2-. (ii) Compare the first ionisation energy of atom A with that of atom C.

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