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201. How many neutrons are in a neutral atom of iron-58?
    
A. 26 Mass Number = number of protons  +  number of neutrons

number of neutrons = Mass Number - number of protons

Atomic Number = number of protons = 26   (Look on Periodic Chart)

number of neutrons = 58 - 26 = 32     The Correct Answer is D.
B. 28
C. 30
D. 32