A) \[_{7}^{14}N\]
B) \[_{55}^{133}Cs\]
C) \[_{18}^{40}Ar\]
D) \[_{8}^{16}O\]
Correct Answer: B
Solution :
[b] \[A{{s}_{55}}\,C{{s}^{133}}\] has larger size among the four atoms given, thus electrons present in the outermost orbit will be away from the nucleus and the electrostatic force experienced by electrons due to nucleus will be minimum. Therefore, the energy required to liberate electrons from outer orbit will be minimum in case of\[_{55}{{C}^{133}}\].
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