Answer
Au would have the higher ionization energy because ionization energy increases as you move down a group of transition metals. A there is a large increase in the number of protons, but not a large increase in size, the ionization energy increases.
Work Step by Step
Au would have the higher ionization energy because ionization energy increases as you move down a group of transition metals. A there is a large increase in the number of protons, but not a large increase in size, the ionization energy increases.
