Consider the following
I) The order of first ionisation enthalpy of first three elements of 3^rd period is $\mathrm{Mg}>\mathrm{Al}>\mathrm{Na}$
II) The element with electronegativity of 3.5 is chlorine 
III) The order of sizes of ions ${\mathrm{Mg}}^{2+},{\mathrm{Na}}^{+},{\mathrm{F}}^{-}$ and ${\mathrm{O}}^{2-}$ is  ${\mathrm{Mg}}^{2+}<{\mathrm{Na}}^{+}<\mathrm{F}<{\mathrm{O}}^{2-}$ 
IV) The IUPAC name of the element with atomic number 106 is Bohrium
The correct statements are