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Question

What should be the atomic number of the next halogen if discovered in the future?

A
115
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B
119
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C
117
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D
121
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Solution

The correct option is C 117
The next halogen will have 7s27p5 outer configuration. Since the fillings of 7p-orbitals will begin after 5f and 6d-orbitals, thus the atomic number of the new halogen will be 112 (up to the fillings of 6d-orbitals ) plus 5 i.e. 117.

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