Ra-226 occurs when U-238 undergoes radioactive decay. Determine the number of protons, electrons, and neutrons in Ra-226.

• A. # of protons = 88
  # of electrons = 88
  # of neutrons = 138
• B. # of protons = 86
  # of electrons = 86
  # of neutrons = 226
• C. # of protons = 88
  # of electrons = 88
  # of neutrons = 226
• D. # of protons = 86
  # of electrons = 86
  # of neutrons = 140

Answer: (A)