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Q.

Which of the following is radioactive halogen?

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a

Br

b

Cl

c

I

d

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] 4f145d106s26p5.

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