Which of the following is closest to the atomic mass of zinc (Zn)?

• A. 65.39
• B. 47.87
• C. 55.85
• D. 63.55

Answer: (A)

Verified step by step guidance

1. Understand that the atomic mass of an element is the weighted average mass of all its naturally occurring isotopes, measured in atomic mass units (amu).
2. Recall that the atomic number of zinc (Zn) is 30, which identifies the element but does not directly give the atomic mass.
3. Refer to the periodic table to find the atomic mass of zinc, which is usually listed below the element symbol.
4. Compare the given options (47.87, 55.85, 63.55) to the known atomic mass of zinc from the periodic table.
5. Identify the value closest to the known atomic mass of zinc, which is approximately 65.39 amu.