Which one of the following is a transition metal?

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Q: 94 (NDA-I/2010)

Which one of the following is a transition metal?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,9,28,16,9,9,3

keywords: 

{'transition metal': [0, 0, 1, 0], 'magnesium': [1, 0, 2, 3], 'calcium': [2, 0, 0, 4], 'mg': [1, 0, 4, 6], 'mn': [0, 0, 1, 2]}