Question

OF6 is not know but SF6 is known explain ?

Answer 1

There are two reasons that you can have SF6 but not OF6:

Electronegativity. There’s a large amount of positive charge on sulfur in SF6, and this is possible because of the large electronegativity difference between sulfur and fluorine. Oxygen and fluorine have almost the same electronegativity, so oxygen isn’t able to donate enough electron density to fluorine to form OF6.

Atomic size. There isn’t enough room around an oxygen atom for six fluorine atoms.

Answer 2

Answer:

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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