P7 - Radioactivity Flashcards 0.0 / 5 ? PhysicsRadioactivityGCSEAQA Created by: sanjbvbCreated on: 09-12-17 18:20 Radioactive substance Substance that contains unstable nuclei 1 of 8 Plum Pudding Model Large positively charged matter with negatively charged electrons spread about 2 of 8 Alpha particle A charged 2+ particle made of 2 protons and 2 neutrons, mass number of 4) 3 of 8 Alpha decay When an alpha particle is released from nucleus, atomic number ↓2 and mass number ↓4 4 of 8 Beta particle A high-speed electron which is ejected from the nucleus when a neutron changes into a proton 5 of 8 Beta decay When a beta particle is released from nucleus, atomic number ↑1 and mass number is unchanged 6 of 8 Gamma radiation EM radiation from nucleus of atom, uncharged and has no mass 7 of 8 Ionisation When radiation from a radioactive substance knocks electrons out of atoms, making them charged 8 of 8
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