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This nuclei with decomposed is called as parent nuclei and the product nuclei is termed as daughter nuclei.
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But as the ratio of protons to neutrons is increases, protons cannot be held firmly together and hence form an unstable nucleus.
Atoms become unstable due to large neutron to proton ratio.
American physical chemist Willard Libby led a team of scientists in the post World War II era to develop a method that measures radiocarbon activity.
He is credited to be the first scientist to suggest that the unstable carbon isotope called radiocarbon or carbon 14 might exist in living matter. Libby and his team of scientists were able to publish a paper summarizing the first detection of radiocarbon in an organic sample. Libby who first measured radiocarbon’s rate of decay and established 5568 years ± 30 years as the half-life. Libby was awarded the Nobel Prize in Chemistry in recognition of his efforts to develop radiocarbon dating.
Archaeology and other human sciences use radiocarbon dating to prove or disprove theories.