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Understanding Nuclear Fission and Chain Reactions

Atomic structure • Nuclear fission and fusion

Key concepts

What you'll likely be quizzed about

  • Nuclear fission occurs when a heavy nucleus, such as uranium-235, absorbs a neutron and becomes unstable.
  • This instability leads to the nucleus splitting into two smaller nuclei, known as fission fragments, along with the release of additional neutrons and energy in the form of heat and radiation.
  • The fission process is typically initiated by a neutron striking the nucleus.

Flashcards

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How does a chain reaction start in nuclear fission?

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A chain reaction starts when neutrons released from a fission event strike other fissile nuclei, causing them to undergo fission.

Key notes

Important points to keep in mind

Nuclear fission is a splitting process.

Chain reactions can be controlled in reactors.

Uranium-235 and plutonium-239 are common fission fuels.

Fission releases heat used to generate steam for turbines.

Safety mechanisms are vital in nuclear reactors.

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