Given the question: Answer the following question given this paragraph: The period to which a given element belongs can easily be determined from its electron configuration. For example, consider the element nickel (Ni). Its electron configuration is [Ar]3 d 8 4 s 2 . The highest occupied principal energy level is the fourth, indicated by the 4 in the 4 s 2 portion of the configuration. Therefore, nickel can be found in the fourth period of the periodic table. Q: In which period of the periodic table is nickel found? Choices: - First Period - Second Period - Third Period - fourth period A:
The answer is:
fourth period