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NEETChemistryStructure of Atom

Why do the three quantum numbers (n, l, m l ) alone not explain the line spectra observed in multi-electron atoms?

Options

  1. ABecause the quantum numbers do not consider the electron's energy levels.
  2. BBecause the quantum numbers do not account for the electron's spin.
  3. CBecause the quantum numbers do not consider the electron's size.
  4. DBecause the quantum numbers do not account for the electron's orientation.

Correct answer

B. Because the quantum numbers do not account for the electron's spin.

Step-by-step solution

The three quantum numbers (n, l, m l ) can define an atomic orbital energy, shape, and orientation, but they do not account for the electron's spin, which is necessary to explain the line spectra in multi-electron atoms.

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