Identify the element with the electron configuration [Ar] 4s^2 3d^10 4p^5.

To determine the element represented by the electron configuration [Ar] 4s² 3d¹⁰ 4p⁵, we first identify the total number of electrons indicated by this configuration. The notation [Ar] signifies that the configuration begins with the electron configuration of Argon, which contains 18 electrons.

Next, the additional electrons are accounted for in the 4s, 3d, and 4p orbitals:

• The 4s orbital has 2 electrons.

• The 3d orbital has 10 electrons.

• The 4p orbital has 5 electrons.

So, we add these up:

18 (from Argon) + 2 (from 4s) + 10 (from 3d) + 5 (from 4p) = 35 electrons in total.

Now, the element with an atomic number of 35 is Bromine (Br), which is located in Group 17 of the periodic table. Bromine is a halogen, and its position corresponds with the electron configuration we derived.

Therefore, the configuration [Ar] 4s² 3d¹⁰ 4p⁵ distinctly identifies Bromine as the element in question.