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Down the group (darr) i.e. from S to Po,...

Down the group `(darr)` i.e. from `S` to `Po`, tendency to show `-2` oxidation state diminishes. Why ?

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Down the group, i.e from sulphur to polonium the size of the atom increases and electronegativity decreases. Thus, the tendency to accept two more electrons so as to attain the stable electronic configuration of nearest gas decreases, i.e. the tendency to show `-2` oxidation state decreases.
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