In this problem, you will answer some basic questions about the electron configuration notation used to show the number of electrons in each subshell of an atom of a particular element. Why should the As subshell be filled before the 3d? The As subshell has greater spherical symmetry than the 3d subshell. The 4s subshell is farther from the nucleus than the 3d subshell. The 4s subshell is at lower energy than the 3d subshell. The As subshell holds fewer electrons than the 3d subshell. Write the electron configuration for the Na^+ ion, which has ten electrons. Enter 3S^3 for 3s^3, etc. Separate the subshells by spaces. 1*s^2, 2*2, 2*p^6, 3*s^1 Write the electron configuration for the Br^- ion, which has thirty-six electrons. Enter 3s^3 for 3s^3 (e.g., 1s^2 2s^2).
