Which element has the electron configuration [Kr] 5s^2 4d^10 5p^1?

The electron configuration [Kr] 5s² 4d¹⁰ 5p¹ describes the arrangement of electrons in an element that is located in period 5 and group 13 of the periodic table. The notation indicates that this element has a filled 4d subshell with 10 electrons, followed by 2 electrons in the 5s subshell and 1 electron in the 5p subshell.

Indium (In) is the element that fits this description as it is situated in group 13, which includes elements like boron, aluminum, gallium, indium, and thallium. Indium has an atomic number of 49, which corresponds to the provided electron configuration, because the total number of electrons, when counted from the configuration, equals 49 (36 from [Kr] + 2 from 5s^2 + 10 from 4d^10 + 1 from 5p^1).

Other elements listed do not have the same number of total electrons or occupy the same group on the periodic table. Therefore, indium is the correct identification based on the provided configuration.