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This Concept Map, created with IHMC CmapTools, has information related to: 75 Radioactivity, Particle Emission may be Alpha Particle, Spontaneous Disintegration is accompanied by Particle Emission, Some Elements and their Isotopes undergo Spontaneous Disintegration, Instability depends on Relative Numbers of Protons and Neutrons in Nucleus, Some Elements and their Isotopes e.g Heavy Elements like Uranium Plutonium Polonium ..., Alpha Particle is Helium Nucleus: 2 Protons 2 Neutrons, Half Life may range from Seconds to Billions of Years, Some Elements and their Isotopes e.g Isotopes of Light Elements like: Carbon14, Well-Defined Rate for each Isotope is quantified by Half Life, Spontaneous Disintegration may involve Gamma Radiation, One Element each is defined by Number of Protons in Nucleus, Half Life is Time for 50% of Atoms in Sample to Decay, Different Element each is defined by Number of Protons in Nucleus, Some Elements and their Isotopes are Radioactive, Some Elements and their Isotopes are said to "Decay", Spontaneous Disintegration occurs when One Element, Radioactivity is the result of Instability, One Element transforms into Different Element, Beta Particle is Electron, Gamma Radiation is Very High Energy Photon