Nuclear Chemistry| 114 Question and Answers (A+ guide solution)

If an unshielded sample of radioactive material emits alpha particles, what effect will it have on a person sitting in the next room? (Assume the wall between rooms is composed of concrete.) - None, because the wall will block the radiation. In which isotope is the strong nuclear force not strong enough to balance electrostatic forces between protons? - uranium-238 A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correct symbol for this nuclide? - 60 27 Co A stable atom that has a large nucleus most likely contains - more neutrons than protons. Which particles that make up an atom are involved in nuclear reactions? - protons and neutrons Which type of reaction does this diagram represent? - a chain reaction that is caused by nuclear fission The atomic symbol represents potassium-40 (K-40), a radioactive isotope that has 19 protons and 21 neutrons. Which atomic symbol could represent an isotope that results from the decay of K-40? 40 19 K - 40 18 Ar A large atom decays and emits a particle. After the reaction is complete, the atom's mass has changed substantially. What kind of particle has most likely been emitted? - alpha particle The alpha decay of a radioactive nuclide (X) emits a He-4 nucleus and produces an isotope of mc013- . What is X?