What will be the IUPAC nomenclature of the element placed just below the element $A t$ .
Atomic number of At = 85

Ununennium

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Ununhexium

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Ununoctium

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Ununseptium

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Solution

The correct option is D Ununseptium
Astatine is a halogen having atomic number $85$ . The element placed below it would have atomic number $85 + 32 = 117$ .
Thus the correct nomenclature would be Ununseptium with symbol Uus.

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