Sodium has only one naturally occurring isotope, sodium-23. Using the data presented in Table 20.3, explain how the molecular mass of sodium is 22.98976 amu and not the sum of the masses of the protons, neutrons, and electrons.

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01 2 3 3 04 03 04 04 84 86 88 90 90 01 2 9 9 Co Ni Po Po Ra Ra Th Pa U 12 00 18 94 31 00 36 92 51 94 0-1 1 1 2 3 3 4 6 7 9 0 2 3 5 111-15 5 1 0111233 46790123626 1011112233455668 2 enpH He Li Be B C Cr Fe