Oxygen-15, vanadium-51, and bismuth-209 have atomic masses of 15.003065 amu, 50.943964 amu, and 208.980399 amu, respectively. What is the nuclear mass of each isotope? (mass of electrons = 5.485799×10^–4 amu)

• A. Oxygen-15: 15.003065 amu
  Vanadium-51: 50.943964 amu
  Bismuth-209: 208.980399 amu
• B. Oxygen-15: 14.998676 amu
  Vanadium-51: 50.931347 amu
  Bismuth-209: 208.934867 amu
• C. Oxygen-15: 14.999225 amu
  Vanadium-51: 50.928604 amu
  Bismuth-209: 208.911827 amu
• D. Oxygen-15: 14.994836 amu
  Vanadium-51: 50.915986 amu
  Bismuth-209: 208.865746 amu

Answer: (B)