Why SF6 is known but SCl6 is not ? Explain.

Sulphur is a small atom. Hence it can accommodate six small fluorine atoms around it. While size of Chlorine is larger than fluorine, thus S cannot accommodate six large chlorine atoms around it. Moreover, because of low electronegativity of Cl, it cannot easily oxidized sulphur to form S(VI). Hence SCl₆ cannot easily form and stable.

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