Which one of the following best explains the valency of an element?
Correct answer: A. Aufbau principle
- A. Aufbau principle
- B. Hund's rule
- C. Paull's exclusion principle
- D. n+I rule
Explanation
Aufbau principle best explains the valency of an element. The Aufbau principle states that electrons fill orbitals in order of increasing energy. This means that the outermost shell of electrons, which determines the valency of an element, will be filled with the fewest number of electrons possible.
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