Which one of the following best explains the valency of an element?
Correct answer: B. Hund's Rule
- A. Aufbau Principle
- B. Hund's Rule
- C. Pauli's Exclusion Principle
- D. n+l Rule
Explanation
Hund's Rule is the correct answer as it deals with the arrangement of electrons in orbitals, which determines the number of unpaired electrons in the outer shell, impacting the valency of an element. The Aufbau Principle and the n+l Rule are more about the filling order of orbitals rather than directly influencing valency. Pauli's Exclusion Principle ensures each electron is unique but doesn't specifically relate to valency.
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