Calorimetric studies show that the reaction is exothermic. 2no2(g) n2o4(g) + 14.1 kcal. based on this information, which one--if any--of the following additional changes would increase the molar concentration at equilibrium of n2o4(g)?

decrease the pressure
increase the temperature
decrease the concentration of no2(g)
stir the reaction mixture
none of the above

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.