Which element has the electron configuration [Ar] 4s^2 3d^10 4p^3?

The electron configuration [Ar] 4s^2 3d^10 4p^3 corresponds to the element arsenic. In this configuration, [Ar] represents the electron configuration of argon, which accounts for the first 18 electrons. Following that, 2 electrons fill the 4s subshell (4s^2), and then 10 electrons fill the 3d subshell (3d^10). Finally, the configuration ends with 3 electrons in the 4p subshell (4p^3).

Arsenic is found in group 15 of the periodic table and has an atomic number of 33, which confirms that this specific electron configuration correctly represents arsenic. The inclusion of 3 electrons in the 4p subshell is indicative of its position and behavior as a p-block element, confirming the identity of arsenic.