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Question

Which of the following halogen is radioactive?

A
Fluorine
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B
Bromine
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C
Astatine
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D
Chlorine
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Solution

The correct option is C Astatine
Astatine (Atomic No. = 85, Symbol-At) is radioactive and hence occurs in nature only in traces. Therefore, not much is known about its chemistry, though it might be expected to be a metalloid.

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