A) 5
B) 7
C) 15
D) 17
Correct Answer: D
Solution :
Bromine (Atomic number 35), the electronic configuration is \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{10}},4{{p}^{5}}\] So, the number of electrons in all -orbitals is 17 here. Hence, the correct option is [d].
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