객관식
Which one of the following sets of quantum numbers is not possible for an electron in an atom?
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9. Quantum Mechanics
Quantum Numbers: Principal Quantum Number
Multiple Choice
How many energy sublevels are present in the second principal energy level (n = 2)?
A
1
B
2
C
3
D
4
검증된 단계별 안내1
Recall that the number of sublevels in a principal energy level is equal to the principal quantum number \( n \).
For \( n = 2 \), the possible sublevels correspond to the azimuthal quantum number \( l \), which can take integer values from 0 up to \( n-1 \).
Determine the values of \( l \) for \( n = 2 \): \( l = 0 \) and \( l = 1 \).
Each value of \( l \) corresponds to a different sublevel: \( l = 0 \) is the s sublevel, and \( l = 1 \) is the p sublevel.
Count the total number of sublevels for \( n = 2 \), which is the number of allowed \( l \) values, giving the total sublevels present.
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