A) \[{{s}^{2}}{{p}^{4}}\]
B) \[{{s}^{2}}{{p}^{5}}\]
C) \[{{s}^{2}}{{p}^{3}}\]
D) \[{{s}^{2}}{{p}^{6}}\]
Correct Answer: B
Solution :
All of these halogen have seven electrons in their outer shell. The electronic configuration of the valence shell in the ground state being\[n{{s}^{2}}n{{p}^{5}}\]. \[_{9}F=1{{s}^{2}},\underbrace{2{{s}^{2}}\,2{{p}^{5}}}_{{}}\] \[_{17}Cl=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},\underbrace{3{{s}^{2}}\,3{{p}^{5}}}_{{}}\] \[_{35}Br=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},\underbrace{4{{s}^{2}}4{{p}^{5}}}_{{}}\] \[_{53}I=[Xe]\underbrace{4{{f}^{14}}}_{{}}\underbrace{5{{d}^{10}}}_{{}}\underbrace{6{{s}^{2}}\,6{{p}^{5}}}_{{}}\]
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