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Which of the following halogen is radioactive?(a) Fluorine(b) Bromine(c) Astatine(d) ChlorineThe question was asked in a job interview.My question is taken from P-Block topic in section P-Block Elements of Chemistry – Class 12

Answer»

Correct choice is (C) Astatine

Easiest EXPLANATION: 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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