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\[{{\,}_{7}}{{N}^{14}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{6}}{{C}^{14}}+{{\,}_{1}}{{H}^{1}}\]\[{{C}^{14}}\]is a natural radioactive isotope.
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