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When electrons are filling energy levels, the lowest energy sublevels are occupied first. This is A. None of these B. The Aufbau principle C. Hund's rule D. Conservation of energy Reset Selection
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When electrons are filling energy levels, the lowest energy sublevels are

occupied first. This is
A. None of these
B. The Aufbau principle
C. Hund's rule
D. Conservation of energy
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User Richq
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D. Conservation of energy
User Manu M
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