Atoms of U-238 and U-235 differ in structure by three_____________________?
Correct answer: C. Neutrons
- A. Electrons and three protons
- B. Protons
- C. Neutrons
- D. Electrons
Explanation
Isotopes of the same element have the same number of protons and, in neutral atoms, electrons. U-238 has 146 neutrons while U-235 has 143, so they differ by three neutrons.
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