3. Which element is likely to have the largest atomic radius? a) Helium (He) b) Sodium (Na) c) Chlorine (Cl) d) Francium (Fr) 4. What is the term for the energy change when an electron is added to an atom a) Ionization energy b) Electron affinity c) Electronegativity d) Atomic radius 5. Why do cations usually have a smaller size than their parent atoms? a) They gain protons b) They lose protons c) They lose electrons d) They gain electrons

3. The element likely to have the largest atomic radius is d) Francium (Fr). Francium is located in the bottom left corner of the periodic table, which is where the elements with the largest atomic radii are typically found. This is because as you move down a group on the periodic table, the atomic radius increases due to the addition of electron shells.<br /><br />4. The term for the energy change when an electron is added to an atom is b) Electron affinity. Electron affinity refers to the energy change that occurs when an electron is added to a neutral atom to form a negatively charged ion. It is a measure of the tendency of an atom to accept an electron.<br /><br />5. Cations usually have a smaller size than their parent atoms because c) They lose electrons. When an atom loses one or more electrons to become a cation, the remaining electrons are held more tightly by the nucleus due to the decreased electron-electron repulsion. This results in a smaller atomic radius.