In which of the following electronic configurations are only two of the electrons unpaired?

  1. 1s² 2s²
  2. 1s² 2s² 2p³
  3. 1s² 2s² 2p⁴
  4. 1s² 2s² 2p⁵

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In 2p⁴, two electrons remain unpaired according to Hund's rule.
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