Molecular orbitals are filled according to _________________?
Correct answer: D. All these
- A. Auf bau principle
- B. Hunds rule
- C. Paulis Exclusion principle
- D. All these
Explanation
Molecular orbitals are filled using all three rules: the Aufbau principle fills lower-energy orbitals first, the Pauli exclusion principle limits each orbital to two opposite-spin electrons, and Hund's rule applies to orbitals of equal energy. Students may choose the Aufbau principle alone because it is commonly stated as the main filling rule, but it does not give the complete set of filling requirements.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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