A) 115
B) 119
C) 117
D) 121
Correct Answer: C
Solution :
[c] The next halogen will have \[\text{7}{{\text{s}}^{\text{2}}}\text{7}{{\text{p}}^{\text{5}}}\] outer configuration. Since, the filling of 7p-orbitals will begin after 5f and 6d-orbitals, thus the atomic number of the new halogen will be 112 (up to the filling of 6d-orbitals) plus 5, i.e. 117.
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