Which statement is consistent with Hunds rule ?
Correct answer: A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
- A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
- B. The electrons in the same atom cannot have the same four quantum numbers
- C. There is maximum of two electrons is an orbital.
- D. None
Explanation
Hund's rule states that electrons occupy orbitals of equal energy singly with parallel spins before pairing begins. This arrangement reduces electron-electron repulsion and gives the most stable distribution. Option b describes the Pauli exclusion principle, while option c gives only the maximum occupancy of an orbital, so either can be a tempting but incorrect choice.
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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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