1.Radioactive ElementsFoundation Science 4 Class Code SC22102

2. RadioactivityRadioactive decay when the nucleus of an atom gives off energy orparticles.Three types of decay: 1) Alpha () decay gives off protons and neutrons ParticlesNucleus of an atom 3. RadioactivityRadioactive decay when the nucleus of an atom gives off particles. Three types of decay:1) Alpha () decay gives off protons and neutrons2) Beta () decay gives off an electron 4. RadioactivityRadioactive decay when the nucleus of an atom gives off particles. Three types of decay:1) Alpha () decay gives off protons and neutrons2) Beta () decay gives off an electron3) Gamma () decay gives off electromagnetic waves 5. So, Radiation can be energyor a particleIs bottom or top alpha decay? Beta decay? Gamma decay? Gamma () decay Alpha () decay Beta () decay 6. DifferencesThin material can stop most alpha () and beta () decay.Gamma () decay can only be stopped by thick metals suchas lead 7. DifferencesThin material can stop most alpha () and beta () decay.Gamma () decay can only be stopped by thick metals suchas lead 8. Radioactive Elements havelarge atomic numbers The more protons, the more unstable the atoms tend to beAtomicnumbersabove 83 areradioactive 9. IsotopesIsotopes of an element have the same number of protons,but different numbers of neutrons.So, helium (He) has 2 protons . Isotopes of Helium all have2 protons and 4 or 6 neutrons.Some isotopes are unstable, and radioactive. 10. Isotopes 11. Symbols for Radioactivity Radioactive Material Present 12. Geiger CountersGeiger countersmeasure radiation When alpha, beta or gamma radiation hits the sensor, it clicks 13. Geiger Counter How stuff works geiger video 14. Answer in Notebook1. What are the three kinds of radioactive decay?2. What kind of decay can only be stopped by a heavy metal like lead (Pb)?3. What kind of decay gives off electrons?4. What is the only type of decay that gives off energy, and not particles?5. What is used to measure if the radiation level somewhere is safe for humans?6. In your own words, what is an isotope?7. What kind of radiation is this??8. Why do you think lead (Pb) is so good at stopping radiation?