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who discovered radioactivity?
who discovered polonium and radium
pierre and marie curie
spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation
what are alpha particles
helium nuclei (two protons two neutrons)
what are beta particles
how is radiation detected
half life of an element
life taken for half the nuclei in any given sample to decay
what are radioisotopes used in?
- >agricultural research
- >food irradiation
- >smoke alarms
- >in industry
what happens when an atom loses an alpha particle
changes into an atom of an element two places before it.. mass number decreases by four
what happens when an atom loses a beta particle
changes into an atom of an element one place after it.. mass number stays the same
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