Using your data, compare the atomic numbers with the lowest and highest wavelengths in the spectrum. Is there a pattern? What might explain the
presence or absence of a pattern based on what you know about atoms,
electrons, and emission spectra

the answer is c i took the test

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.