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Which of the following statements is true?
1. The 2s orbital in the hydrogen atom is larger than the 3s orbital also in the hydrogen atom.
2. The hydrogen atom has quantized energy levels.
3. The Bohr model of the hydrogen atom has been found to be incorrect.
4. An orbital is the same as a Bohr orbit.
5. The third energy level has three sublevels - the s, p, and d sublevels.

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Answer:

2. The hydrogen atom has quantized energy levels.

Explanation:

The Bohr model of the atom states that the structure of the atom is quantized, that is, that electrons can only orbit the nucleus in specific orbits with a fixed radius. Therefore, the electron cannot be in energy levels that do not correspond to these quantized levels.

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