Given the following atoms and their atomic masses: Hydrogen (1.008 u), Carbon (12.01 u), Oxygen (16.00 u), and Iron (55.85 u), which atom has the highest atomic mass?

• A. Carbon
• B. Hydrogen
• C. Oxygen
• D. Iron

Answer: (D)

Verified step by step guidance

1. Identify the atomic masses given for each element: Hydrogen (1.008 u), Carbon (12.01 u), Oxygen (16.00 u), and Iron (55.85 u).
2. Understand that atomic mass is the average mass of atoms of an element, measured in atomic mass units (u), and it reflects the mass of protons and neutrons in the nucleus.
3. Compare the atomic masses of the listed elements by looking at their numerical values.
4. Determine which atomic mass value is the largest among the given elements.
5. Conclude that the element with the highest atomic mass is the one with the greatest numerical value, which in this case is Iron with 55.85 u.