Rate law only cares about reactants and rate law can only be determined experimentally or by using the coefficients of reactants in elementary reactions
If 2A---->B is an elementary reaction... rate law for this is rate=k[A]^2
So if we look at your question...2N2O5---->2N2O4 + 02 (I think you are missing O2 in question because otherwise equation is unbalanced)
Among the given elements fluorine(F)can not lose electrons easily because of its high electron affinity, high nuclear charge and high electronegativity.