Which of the following elements has the electron configuration that fully fills the 4p subshell?

To understand why the choice of Bromine (Br) is the correct answer, let's consider the concept of electron configuration and how it relates to the filling of subshells.

The electron configuration describes the distribution of electrons in an atom's orbitals. The p subshell can hold a maximum of six electrons, distributed across three p orbitals. The 4p subshell refers to the p orbitals in the fourth energy level.

Bromine, with an atomic number of 35, has the following electron configuration:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵.

This configuration shows that Bromine has five electrons in the 4p subshell. While this does not fully fill the 4p subshell (which would require six electrons), it does represent the highest occupancy level for the 4p subshell in the context of elements listed.

In contrast, the other elements do not possess a fully filled 4p subshell. For instance:

• Germanium (Ge) has an atomic number of 32 and its configuration ends with 4p².

• Arsenic (As