27. The first ionization energy of magnesium is approximately 700 kJ/mol. What is a good estimate for the second ond ionization n energy(k.I/mol) of mag gnesium?
(A)-700
(B)700
(C)-1400
(D)1400
(E)70,000

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統計： A(0), B(1), C(0), D(2), E(0) #2788675