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Atomic Structure Hund's Rule and Unpaired Electrons

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According to Hund's rule, how many unpaired electrons are present in the ground-state phosphorus atom, Z = 15?

Verified Answer & Explanation⌄

Correct Answer: C) 3

Concept Explanation

Phosphorus: 1s² 2s² 2p⁶ 3s² 3p³ The three 3p electrons occupy three different p-orbitals with parallel spins. Therefore, P has 3 unpaired electrons.

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