4. The halogens are the elements that make up Group 17 in the Periodic Table (the second column from the right). As you have learned, these elements tend to gain one electron to complete their octets and attain electron configurations that are isoelectronic with the noble gases. The negative ions are called "halides". a. Draw Lewis dot structures for each of the halogen molecules, F2, Cl2, Br2, and I2. b. Based on the periodic trends, which of the halogen molecules do you expect to have the shortest bond? Why? c. Based on periodic trends, which halide ion, X, will be most stable, that is, lowest in energy? Briefly explain your reasoning.