The line spectra of two elements are not identical because

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Explanation:

Line spectra arise from electronic transitions between energy levels. Each element has a unique set of energy levels determined by its nuclear charge (atomic number) and electron configuration.

- Options (a) and (b) — neutrons and mass numbers affect nuclear properties but not the electronic energy levels significantly.
- Option (c) ✓ — Different elements have different atomic numbers → different nuclear charges → different electron energy levels → different spectral lines.

The u

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