AP Chemistry
1.5 Atomic Structure and Electron Configuration
The predicted ground-state electron configuration for chromium (\(\text{Cr}\), atomic number 24) based strictly on the Aufbau principle is \([\text{Ar}]\,3d^4\,4s^2\). However, experimental measurements show that the actual ground-state electron configuration of a neutral \(\text{Cr}\) atom is \([\text{Ar}]\,3d^5\,4s^1\). Which of the following best identifies the actual configuration and provides the correct justification for its relative stability?
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