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Which of the following is radioactive halogen?

$\begin{array}{1 1}Cl\\Br\\I\\At\end{array} $

1 Answer

Answer : At
Astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group. Because the halogen elements have seven valence electrons, they only require one additional electron to form a full octet. This characteristic makes them more reactive than other non-metal groups.
At is radioactive halogen
answered Jul 28, 2014 by sreemathi.v
edited Nov 22, 2017 by sharmaaparna1