Why does oxygen not form of6?

it has large size. Because there is no vacant d-orbitals in oxygen so it cannot increase its coordination number and does not show higher positive oxidation state.

Why can SF6 exist when the corresponding of6 does not?

Even OF4 is impossible; there are 2 electrons we can’t account for when trying a Lewis dot structure. This is the actual reason SF6 is possible.

Why Sulphur can form sf2 sf4 and SF6 whereas oxygen only forms of2?

Sulfur has ground state electrons in d-orbitals. Oxygen can only form chemical bonds with the two valence electrons in its unpaired electrons of the 2p orbitals. However, sulphur can form chemical bonds using the unpaired electrons in the 3p and 3d orbitals.

Why can sulfur expand its octet but oxygen Cannot?

It can excite some its paired electrons into this empty orbital, spreading them out, so each can now form bonds and expand an octet to 12 electrons. Oxygen has no empty orbital in quantum 2, so cannot excite and ‘spread’ its electrons, so cannot bond these to form an expanded octet.

Why can Sulfur Form SF4 and SF6?

Indeed, oxygen can only bond with fluorine to form oxygen difluoride, OF2 . On the other hand, sulfur can easily form sulfur difluoride, SF2 , sulfur tetrafluoride, SF4 , and sulfur hexafluoride, SF6 . This is a drirect consequence of the fact that sulfur’s outermost electrons are further away from the nucleus.

Why does SF6 form sulphur?

Sulphur has 6 Valance electrons so according to VBT it can form maximum of 6 covalent bonds. Same is with Oxygen but that can form maximum of 3 covalent bonds. This is because of availablity of vacant d orbitals in Sulphur, which can accommodate extra electrons other than octet. Thus sulphur forms SF6.

Why does SF6 exist but not SH6?

Only atoms of high electronegativity such as fluorine (4.0) can cause the promotion of electrons while the same is not possible with hydrogen with comparatively less electronegativity (2.1). Thus, SF6 can exist while SH6 cannot.

Why does SF4 exist but not OF4?

Unfortunately, valence shell of oxygen is 2nd shell where there is no d orbital. So, oxygen can’t extend its covalency to 4. Hence, it can’t form OF4. But SF4 exists, as S has 3d orbitals.

Why can SF6 expand octet S?

Now sulfur has 6 unpaired electrons which means it can form 6 covalent bonds to give a total of 12 electrons around its valence shell. So in addition to being octet, sulfur can expand octet to have 10 or 12 electrons.