Edexcel GCSE Combined Science · 1SC0
Paper 5, Paper 6
Revise: Atomic models and isotopesThe mass number, or nucleon number, is the total number of protons and neutrons in the nucleus.
- Revise: Nuclear decay mechanisms and equations
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GCSE Combined Science · key term
A proton or neutron in an atomic nucleus.
Used by Edexcel
Paper 5, Paper 6
Revise: Atomic models and isotopesThe mass number, or nucleon number, is the total number of protons and neutrons in the nucleus.
In beta decay, the mass number stays constant because one nucleon changes type; the nucleus does not lose a nucleon.
Gamma emission changes the nucleus’s energy, not its proton or nucleon number.
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