Reconstruct particle events or build atoms from protons, neutrons and electrons using evaluated isotope stability, half-life and decay data for AQA, OCR A, GCSE and A Level.
Learning guide and suggested activities
What this tool shows
How nuclide notation and nuclear equations balance proton and nucleon number
Why beta-minus decay requires an electron antineutrino at A Level
How particles and antiparticles annihilate or can be created as pairs
How up, down and strange quarks combine and change during particle events
How charge, baryon number, lepton-family numbers and strangeness test an AQA interaction
How the permitted particles, diagrams and conservation ledger change with the selected specification
How proton, neutron and electron counts set element identity, isotope and ion charge
How stable, radioactive and metastable nuclei differ across the full periodic table
How alpha, beta-minus, beta-plus and gamma decay create daughter nuclei with measured half-lives
How a free neutron beta-decays while conserving charge, baryon number and electron-lepton number
OCR A relevance
OCR A H556 sections 6.4.1–6.4.4: nuclear atom, fundamental particles, quarks and pair creation/annihilation
OCR A beta-minus and beta-plus quark transformations and charge balance