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SF6 is known but OF6 is not known.Why?

Oxygen is a second period element. This places restrictions on its bonding, because it can only use the s and p orbitals from the second shell in bonding. These orbitals can only hold 8 electrons. Since oxygen already has 6, covalent bonding with 2fluorine atoms will give it 8.

Sulfur is a third-period element. This means it has access to a d-orbital that can hold extra electrons. Because of this extra space (a d-orbital can hold 10 electrons in total), sulfur can bind to more than 2 fluorine atoms.

 
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sulphur has vacant d orbital so it can go expansion of octet while oxygen cannot so it is never possible for oxygen to get attached with six elements.another factor is small size of oxygen which leads to overcrowding of florine atoms .hence it is not possible

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this is an exception of octet rule......

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why is of6 compound not known in 17 element

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  Sulfur can expand its octet to support more than 8 valence electrons whereas oxygencannot. Most elements of the third period or below are able to do this because of the unfilled d orbitals.

 

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because for the formation of OF6 compound there should be six unpaired electrons in oxygen atom is requierd and this is not possible due to absence of 'd' orbitals , secondly the small atomic size of oxygen can not accommodates six fluorine atoms.

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Because in OF6 there is an absence of d-orbital so no electron is promoted to d-orbital that's why it does not form
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Can I ans that both are electronegative
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