In case of [FeF6]3–complex ion, the oxidation state of central iron metal is +3.
The atomic number of iron metal : 26 and that of ion(III)ion : 23. Valence shell electronic configuration of Fe(III) ion : [ Ar ] d5.
Co-ordination number of central metal Fe(III)ion : 6. Arrangement of [FeF6]3– complex ion : Octahedral.
Now ligand F–, which is a weak field ligand. Under the influence of the octahedral