Why sulfur hexafluoride does not exist?

Fluorine is most electronegative and Sulfur is electropositive in this particular case so it forms SF6. But SH6 doesn’t exist because hydrogen is electropositive and Sulfur is electronegative.

Why SH6 is not possible?

Hydrogen is a very weak oxidizing agent as compared to fluorine this means that hydrogen is not able to oxidise sulphur to its maximum oxidation state. Hence, $S{{H}_{6}}$ does not exist.

Why does PH5 doesn’t exist?

PH5 doesn’t exist because p- orbital of P interacts with s-orbital of H. The bond formed via this hybridisation is not stable and energetically favourable. Whereas in case of PCL5 both energy and hybridisation of orbitals are stable. That’s why PH5 is unstable and does not exist whereas PCL5 exist and stable.

Why is SF6 known but not scl6?

Answer: Fluorine atom is smaller in size so, six F- ions can surround a sulphur atom. The case is not so with chlorine atom due to its large size. So, SF6 is known but SCI6 is not known due to interionic repulsion between larger ions.

Why is SF6 known but not SH6?

sf6 exist because electronegativity of fluorine is most high, it is of small size and high polarising power but it is not possible in SH6.

Does PH5 exist?

PH5 doesn’t exist because p- orbital of P interacts with s-orbital of H. The bond formed via this hybridisation is not stable and energetically favourable. Whereas in case of PCL5 both energy and hybridisation of orbitals are stable.

Does f6 exist?

OF6 does not exist but SF6, exists.

Why PCL5 exist but PH5 do not exist?

In case of PCl5 since Chlorine is more electronegative than Phosphorus thus it gets partial positive charge. Thus the orbitals undergo hybridisation.

Why does phph3 exist but PH5 does not?

PH3 exists but PH5 does not. Why? Hence,p orbital has 3 electron which is unpaired. So, 3 hydrogen goes to 3 unpaired electron of p orbital & becomes paired n form ph3.

Why does PH5 not exist in the periodic table?

Since the phosrorus has its last electron in d orbital and hydrogen has the last electron in s orbital and since the energy difference in very high overlap doesn`t takes places in a good manners and so PH5 doesn`t.exist

Is it possible to make PH5 from phosphorus?

So, its not possible. Although phosphorus exhibits +3 and +5 oxidation states, it cannot form PH5 . Beside some other considerations, high enthalpy of atomization value of dihydrogen and electron gain enthalpy of hydrogen do not favour to exhibit the highest oxidation state of phosphorus,and consequently the formation of PH5.

Why PH5 does not exist in octet rule?

Since the phosrorus has its last electron in d orbital and hydrogen has the last electron in s orbital and since the energy difference in very high overlap doesn`t takes places in a good manners and so PH5 doesn`t.exist It is one of the examples of the limitations of the octet rule I.e. expanded octet. So, its not possible.