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As the principal quantum number (orbit number) increases in the Bohr model of the hydrogen atom, how do the kinetic energy (KE) and potential energy (PE) of the electron change?

1. KE increases.
2. KE decreases.
3. PE decreases.
4. PE increases.

Correct answer: KE decreases.

Solution

In the Bohr model, kinetic energy KE proportional to 1/n² decreases as n increases. Potential energy PE = -2*KE is negative and becomes less negative (increases) as n increases. Both B and D are correct, but B (KE decreases) is the primary answer for a single-choice question.

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