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Topic: CHEMISTRY

radioactivity

 noun
     
ra‧di‧o‧ac‧tiv‧i‧ty [uncountable]
HCSGE the sending out of radiation (=a form of energy) when the nucleus (=central part) of an atom has broken apart:
the discovery of radioactivity
high levels of radioactivity
Definition of radioactivity from the Longman Dictionary of Contemporary English within
the topic CHEMISTRY
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