Notes
P6 OCR 21st century revision
Content of the notes (1)
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P6 REVISION:- Radioactivity
The nucleus of an atom contains protons and neutrons which make up most of the mass of the atom as electrons make up virtually no mass. Radioactive elements emit ionising radiation : This is because radioactive atoms are unstable, however, as they decay they become more stable. The timing of the decay is random and