What is the difference between Aufbau principle and Hund's rule?
Aufbau decides the ORDER subshells fill (low to high energy); Hund decides HOW electrons spread within a subshell (singly, same spin).
Aufbau decides the ORDER subshells fill (low to high energy); Hund decides HOW electrons spread within a subshell (singly, same spin). A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
Aufbau principle vs Hund's rule
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