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GCSE Physics · key term
The original unstable nucleus before radioactive decay occurs.
Used by Edexcel and OCR
Specification 6.18, 6.19, 6.22 · Paper 1
The unstable nucleus before radioactive decay occurs.
The original unstable nucleus in a nuclear change.
Specification P6.1f · Paper 2 (Foundation), Paper 4 (Higher)
The original unstable nucleus that undergoes radioactive decay.
Revise: Balanced equations for decayAn unstable parent nucleus changes into a daughter nucleus and emits radiation.
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