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Final answer:Manganese-54 has 29 neutrons, which can be found by subtracting theatomic number(25) from the mass number (54).Explanation:The number of neutrons in an atom can be found by subtracting the atomic number (number of protons) from the mass number (total number of protons and neutrons). To find the number of neutrons in Manganese-54, we need to subtract its atomic number (25) from itsmass number(54). So, the equation would be 54 - 25 = 29 neutrons. So, the correct answer is C) 29.Learn more about Number of Neutrons here:brainly.com/question/28716465#SPJ11...

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