Question
Chemistry Question on Classification of elements & periodicity in properties
What would be the atomic number of the next halogen if discovered in future?
A
115
B
119
C
117
D
121
Answer
117
Explanation
Solution
The next halogen will have 7s27p5 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.