Which of the following is the atomic mass of manganese (Mn)?

• A. 58.93 u
• B. 54.94 u
• C. 55.85 u
• D. 63.55 u

Answer: (B)

Verified step by step guidance

1. Understand that the atomic mass of an element is the weighted average mass of all the isotopes of that element, measured in atomic mass units (u).
2. Recall that the atomic mass is usually found on the periodic table and represents the average mass of naturally occurring isotopes of the element.
3. Identify manganese (Mn) on the periodic table to find its atomic mass value.
4. Compare the given options to the atomic mass value listed for manganese on the periodic table.
5. Select the value closest to the periodic table's atomic mass for manganese, which is approximately 54.94 u.