A) \[Rn\]
B) \[Kr\]
C) \[Ne\]
D) \[Ar\]
Correct Answer: A
Solution :
Rn because it is radioactive element obtained by the disintegration of radium \[_{88}R{{a}^{206}}\,\to {{\,}_{86}}R{{n}^{202}}{{+}_{2}}H{{e}^{4}}\]
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