After using the flow chart to determine electron configuration, which of the following elements has its configuration altered by the application of Hund's rule?
A. Fluorine
B. Argon
C. Copper
C
The part of Hund's rule used in this question states that atoms are more stable with subshells in the full or half-full configuration. One of the electrons in copper will drop into the 3d subshell so that the 3d subshell contains ten electrons. The electron configuration of copper is: [Ar]4s3d .
