A) \[_{13}A{{l}^{27}}\]
B) \[_{26}F{{e}^{56}}\]
C) \[_{83}B{{i}^{209}}\]
D) \[_{92}{{U}^{238}}\]
Correct Answer: C
Solution :
Magic numbers are 2, 8, 20, 28, 50 or 82 protons or 2, 8, 20, 28, 50, 82 or 126 neutrons in the nucleus. These numbers impart stability to the nucleus. (a) \[_{13}A{{l}^{27}}\], no. of neutrons \[=27-13=14\] (b)\[_{26}F{{e}^{56}}\], no. of neutrons\[=56-26=30\] (c)\[_{83}B{{i}^{209}}\], no. of neutrons\[=209-83=126\] (d)\[_{92}{{U}^{238}}\], no. of neutrons\[=238-92=146\]
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