J. J. Thomson's use of creativity in his work

Thomson used creativity to interpret the results of the cathode ray tube experiment. ... Rutherford's results showed that most of an atom is empty space and that the mass is concentrated in the center of the atom. This discovery required the plum pudding model to revised.

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.