Which of the following is closest to the atomic mass of neon (Ne)?

• A. 20.18 u
• B. 28.09 u
• C. 14.01 u
• D. 22.99 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 neon (Ne) is a noble gas with atomic number 10, and its atomic mass is close to the mass of its most abundant isotopes.
3. Compare the given options to typical atomic masses of common elements: 28.09 u corresponds roughly to silicon, 14.01 u to nitrogen, and 22.99 u to sodium.
4. Recognize that neon's atomic mass is approximately 20 u, which is closest to 20.18 u among the options provided.
5. Therefore, select the value closest to 20.18 u as the atomic mass of neon.