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MMLU / Excited states of the helium atom can be characterized as para- (antiparallel…

Problem

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question

Excited states of the helium atom can be characterized as para- (antiparallel electron spins) and ortho- (parallel electron spins). The observation that an ortho- state has lower energy than the corresponding para- state can be understood in terms of which of the following?

choices

  1. The Heisenberg uncertainty principle
  2. The Pauli exclusion principle
  3. The Bohr model of the atom
  4. Nuclear hyperfine coupling

subject

college_physics

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