Which of the following is radioactive halogen?

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$Br$

$Cl$

$I$

$At$

answer is D.

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Detailed Solution

Astatine is the name of the radioactive halogen. At is its chemical symbol. It has the atomic number 85. It is a member of the periodic table's sixth period and 17th group. The electronic setup of it is $[Xe] 4 f^{14} 5 d^{10} 6 s^{2} 6 p^{5}$ .

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