Final answer:
The halogen among the listed elements is Iodine (E), as halogens are located in Group 17 of the periodic table.
Step-by-step explanation:
The student asked which of the following is a halogen: Sodium, Copper, Neodymium, Selenium, or Iodine. According to the periodic table, halogens are found in Group 17, which includes fluorine, chlorine, bromine, iodine, and astatine. These elements are known for being 'salt forming' and react readily with metals to form compounds such as sodium chloride. Therefore, the correct answer to which element is a halogen is E) Iodine.