Which element corresponds to the electron configuration [Xe] 6s^2 4f^14 5d^7?

To determine which element corresponds to the electron configuration [Xe] 6s^2 4f^14 5d^7, let's break down the configuration provided. The notation '[Xe]' indicates that the electron configuration starts from the noble gas xenon, which accounts for the first 54 electrons. Following xenon, the configuration specifies 2 electrons in the 6s subshell, which adds 2 more electrons, and then 14 electrons in the 4f subshell, totaling 70 electrons so far. Finally, there are 7 electrons in the 5d subshell, bringing the total to 77 electrons.

The element with atomic number 77 is Plutonium. Among the given choices, the only element that has an atomic number equal to 77 and matches the described electron configuration is Iridium (Ir). It's important to recognize that the d-block elements, particularly the transition metals, can often have similar electron configurations, but the specific count and order of electrons lead to the identification of Iridium as the element corresponding to this configuration.

This understanding of electron configuration helps in identifying the elements and understanding their chemical properties, as well as their placement in the periodic table.