abt oxidizing agent

Astatine (At2) is a weaker oxidizing agent than iodine (I)2.

Both astatine and iodine are Group VII elements. Down Group VII, the oxidizing power of the elements is decreasing, i.e.
Oxidizing power: F2 > Cl2 > Br2 > I2 > At2
The oxidizing power of astatine is the weakest among all Group VII elements, because it would form weak ionic bonds and covalent bonds due to the large sizes of its cation and atom.)

Astatine is usually not used in secondary school laboratory, because
(1) the abundance of astatine is very low; and
(2) all isotopes of astatine are radioactive.
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