What is the Atomic Mass of Sodium? Last Updated : 10 Feb, 2024 Improve Improve Like Article Like Save Share Report Atomic Mass of Sodium is . A) 21 B) 22 C) 23 D) 24 Answer: The atomic mass of Sodium is 23 amu. Therefore, the correct option is C. Explanation: Atomic Mass of any substance is the sum of the number of protons and the number of neutrons in the nucleus of that atom. For Sodium, Number of Protons = 11 Number of Neutrons = 12 Thus, Atomic Mass of Sodium = 11 + 12 = 23 In absolute terms, the average atomic mass of sodium is 22.989769 amu. It is calculated taking into account all the isotopes of Sodium. Like Article Suggest improvement Previous What is a General Formula for an Ester? Next Arrhenius Equation Share your thoughts in the comments Add Your Comment Please Login to comment...