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Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest 0 M / M 2 3 E + + value ?

1. Fe(Z = 26)
2. Co(Z = 27)
3. Cr(Z = 24)
4. Mn(Z = 25)

Correct answer: Co(Z = 27)

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