Instructions: type the correct answer in each box. use numerals instead of words.

a scientist identifies a particular atom as an atom of chlorine. the scientist also determines that the atom has no net charge. this atom has proton(s) and electron(s). this atom has electron(s) in its outermost energy level.

what are the blanks?

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.