The work of warren washington would be most likely to explain which of the following phenomena
a. a gradual increase in earth average temperature
b. a decrease in the light reflection of the moon
c. a slight change in the orbital speed of mars
d. a slow change in the location of earth north magnetic pole

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.