Which of the following is closest to the atomic mass of beryllium?

• A. 9.01 u
• B. 6.94 u
• C. 12.01 u
• D. 10.81 u

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 (u).
2. Recall that beryllium (Be) is an element with atomic number 4, and its atomic mass is typically found on the periodic table.
3. Review the given options: 6.94 u, 12.01 u, 10.81 u, and 9.01 u, and recognize that 12.01 u corresponds to carbon and 10.81 u corresponds to boron, which are different elements.
4. Compare the remaining options (6.94 u and 9.01 u) to the known atomic mass of beryllium, which is approximately 9.01 u.
5. Conclude that the value closest to the atomic mass of beryllium is 9.01 u, based on standard periodic table data.