Identify the correct element that fits the configuration [Rn] 7s^2 5f^14 6d^3.

The electron configuration [Rn] 7s² 5f¹⁴ 6d³ corresponds to the element Dubnium (Db). To understand why, it's important to analyze the breakdown of the electron configuration.

The notation [Rn] indicates that the configuration includes all the electrons that are present in Radon, which accounts for the first 86 electrons. Following Radon, the configuration continues with 7s², which fills the 7s subshell with 2 electrons. Next, the 5f¹⁴ indicates that the 5f subshell is fully filled with 14 electrons, which is the maximum number of electrons that can occupy that subshell.

Finally, the 6d³ designation means that there are 3 electrons in the 6d subshell. The order of filling these subshells follows the Aufbau principle, where subshells are filled according to their energy levels.

In the periodic table, Dubnium is located in period 7, and specifically, it is a transition metal in group 5 that corresponds to the filling of the 6d subshell. This is consistent with the given electron configuration, making Dubnium the correct answer.

Other elements like Einsteinium, Fermium