Astatine is the element below iodine in the group $\mathrm{VIIA}$of the periodic table. Which of the following statements is not true for astatine?

The oxidation state of sulphur in the anions ${\mathrm{SO}}_3^{2-}$, ${\mathrm{SO}}_4^{2-}$, ${\mathrm{S}}_2{\mathrm{O}}_4^{2-}$ and ${\mathrm{S}}_2{\mathrm{O}}_6^{2-}$ follows the order

$\mathrm{NaCl}+\mathrm{A}⟶{\mathrm{NaNO}}_3+\mathrm{B}+{\mathrm{Cl}}_2+{\mathrm{H}}_2\mathrm{O}$
$\mathrm{B}+{\mathrm{O}}_2⟶\mathrm{C}+{\mathrm{Cl}}_2$
$\mathrm{C}+{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}⟶\mathrm{A}$

$\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$, respectively, are: