Write the ground-state electronic configuration of chromium (Z = 24) and explain why it deviates from the conf

Example · Example 11

Z = 24

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Chromium has $Z = 24$ electrons. Applying the simple Aufbau order predicts $[\text{Ar}]\,3d^4\,4s^2$ (18 core electrons in $[\text{Ar}]$ , plus 4 in $3d$ and 2 in $4s$ ). Experimentally, however, chromium's actual ground-state configuration is

[\text{Ar}]\,3d^5\,4s^1

One electron that the simple rule would place in $4s$ instead moves into $3d$ , so that the $3d$ subshell becomes exactly half-filled (one electron in each of its five orbitals, all with parallel spin, by Hund's rule) while the $4s$ subshell becomes exactly half-filled as well (one electron in its single orbital). …

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Q.Write the ground-state electronic configuration of chromium ( $Z = 24$ ) and explain why it deviates from the configuration predicted by the simple Aufbau order.

Concept understanding — Stability of Half-filled and Fully-filled Orbitals

Q.Write the ground-state electronic configuration of chromium (Z=24Z = 24Z=24) and explain why it deviates from the configuration predicted by the simple Aufbau order.

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Q.Write the ground-state electronic configuration of chromium ( $Z = 24$ ) and explain why it deviates from the configuration predicted by the simple Aufbau order.

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