Which model of the atomic theory first stated that "at the center of the atom is a dense area of positive charge called a nucleus. It also states that the electrons are
outside of the nucleus and that the area between the nucleus and electrons is
mostly empty space."

it would be a gas formation

the right answer is c i just did the question.

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.