A) 7
B) 17
C) 27
D) 37
Correct Answer: B
Solution :
Key Idea: Write electronic configuration o/Br atom according to aufbau rule and count number electrons of p-orbitals. Br, atomic number is 35. Configuration of bromine is \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{10}},4{{p}^{5}}\] \[\therefore \] Total p electrons in Br = 6 + 6 + 5 = 17
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