To identify the correct numbers of subatomic particles for one atom of iron, we need to refer to the atomic number and atomic mass of iron (Fe) from the periodic table.
- The atomic number of iron (Fe) is 26, which means it has 26 protons and, in a neutral atom, also 26 electrons.
- The most common isotope of iron has an atomic mass (rounded) of approximately 55. To find the number of neutrons, we subtract the atomic number from the atomic mass:
- \( \text{Number of neutrons} = \text{atomic mass} - \text{atomic number} = 55 - 26 = 29 \).
Based on this calculation, one atom of iron has:
- 26 electrons
- 26 protons
- 29 neutrons
None of the provided responses includes the correct number of neutrons. If "30 neutrons" were within normal rounding, it could be justifiable, but the clearly defined subatomic particles do not align with the standard atomic composition based on common isotopes.
Thus, the closest appropriate option from the choices provided would be: One atom of iron would have 26 electrons, 26 protons, and 30 neutrons. However, note that while the neutrons might not perfectly match typical isotopic counts, it is the most relevant option.