GCSE Combined Science (AQA)

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Unstable Nuclei

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Atomic structure Atoms and nuclear radiation

Unstable Nuclei

2:07 Radioactive Acivity
Spec 4.4.2.1
Previous Irradiation & Radiation Type Next Radioactive Activity
  • Most atomic nuclei are stable and unchanged for millions of years.
  • Nucleus consists of protons and neutrons held by strong forces.
  • Nuclei remain unchanged during chemical reactions; only electron configurations change.
  • Some nuclei are unstable and struggle to hold together.
  • Large numbers of protons or neutrons can cause instability.
  • GCSE level does not require detailed knowledge of nuclear stability.
  • Unstable nuclei release particles or energy to become stable, a process known as radioactivity.
  • Nuclear decay involves the nucleus becoming smaller and more stable.
  • Alpha radiation is one type of radiation released during decay.
  • Nuclear decay is a random process dependent on the nucleus's nature.
  • Decay rate is similar for similar nuclei and is not affected by external conditions like temperature.
  • Nuclear decay is unpredictable and cannot be controlled or altered by humans.
  • Understanding the randomness and unpredictability of nuclear decay is important for exams.

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