Which of these is an example of an experiment? Add different kinds of soil to three potted plants.
Beach erosion increased during the last winter storm.
Temperature changes may be due to wind patterns.
Wonder why some layers of rocks contain fossils.

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.