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Electron Distribution in Different Orbits

What should b...

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 $7 s^{2} 7 p^{5}$ 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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