A. It gains one electron to form a Cl1- ion. B. It gains one electron to form a Cl1+ ion. C. It loses one electron to form a Cl1- ion. D. It loses one electron to form a Cl1+ ion.
You do have a printed periodic table, right? You can get the information at www.chemicalelements.com/index.html but you really need your own printed copy to carry with you. It will be a primary reference for everything you do.
