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What would be the atomic number of the l...

What would be the atomic number of the last member of the halogen group?

A

115

B

119

C

117

D

121

Text Solution

Verified by Experts

The correct Answer is:
C
The last halogen will have `7s^(2) 7p^(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 (upto the filling of 6d-orbitals) plus 5, i.e., 117.
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