Which of these statements about electron energy levels in hydrogen atoms is true?
A. An electron with a positive total energy is a bound electron.
B. The orbital angular momentum of an electron in the ground state is zero.
C. An electron in the hydrogen atom is best represented as a traveling wave.
D. An electron in state n can make transitions only to the state n + 1 or n - 1.
B. The orbital angular momentum of an electron in the ground state is zero.
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