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An iron atom has an atomic number of 26 and an atomic mass of 55.8 amu. How many protons does an iron atom have?
The iron atom has 26 protons.
Natural iron is a mixture of , but the major isotope is ##""_26^56"Fe"##.
The smaller number is the ##Z##: the number of protons.
Thus, an iron atom has 26 protons.