Unit 3: Geologic time-Radioactivity
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5 Terms
What is radioactivity?
The spontaneous breaking apart of atomic nuclei
A ____ isotope is formed when a ____ decays
Daughter
Parent (unstable isotope)
True or False: The decay rate of an unstable isotope changes and cannot be predicted
False: The decay rate is constant, each isotope has their own unique rate of decay
Match the following:
Alpha emission ___ Release of an electron from the nucleus
Beta emission ___ Capture of free electron from nucleus
Electron capture ___ Release of helium nuclei (2 proton, 2 neutron)
Alpha emission-Release of helium nuclei (2 proton, 2 neutron)
Beta emission-Release of an electron from the nucleus (turning a proton into a neutron)
Electron capture-Capture of free electron from nucleus
True or false: There are 100 parent atoms at the beginning, soon there are 25 parents and 75 daughters. These atoms go through 2 half lives
True: first half life made the parent and daughter ratio 50/50, the second took half the parent atoms and added them to the daughters making the ratio 25/75
Note 
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