How many of the following statements about fluorine are true?
I) It has more negative electron gain enthalpy than chlorine.
II) It has small atomic size as compared to other halogens.
III) d-orbitals are available in its valency shell.  
IV) It has less electro negativity.
V)  $F^{-}$ ion has highest hydration energy among halide ions. 
VI) It has the strongest oxidizing power among halogens.
VII) It has low bond dissociation enthalpy than $B{r}_2$.