A) a natural non-radioactive isotope
B) an artificial non-radioactive isotope
C) an artificial radioactive isotope
D) a natural radioactive isotope.
Correct Answer: D
Solution :
Carbon has three important isotopes \[{{C}^{12}},{{C}^{13}}\], and \[{{C}^{14}}.{{C}^{14}}\] is formed is traces in the atmosphere by cosmic neutron bombardment of nitrogen \[_{7}{{N}^{14}}+o{{n}^{1}}{{\xrightarrow{{}}}_{6}}{{C}^{14}}{{+}_{1}}{{H}^{1}}\] \[{{C}^{14}}\] is a natural radioactive isotope.
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