Identify intermediate A, which has a molecular formula of C10H16O2, and give a curved-arrow mechanism for the transformation of A to the final product. Details count! Show ALL lone pairs of electrons and formal charges. Once you have supplied the organic intermediate A, do not add or remove atoms for the rest of the steps (i. e., atom conservation). If a CHx group is being deprotonated, draw all H\'s on the reacting site.

you need to have a picture of the atom that way we can answer it

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.