Multiple Choice
Which of the following ranks the orbitals 1s, 2s, and 3s in order of increasing size?
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9. Quantum Mechanics
Quantum Numbers: Principal Quantum Number
Multiple Choice
How many sublevels are present in the principal quantum number n = 3 energy level?
A
2
B
1
C
4
D
3
Verified step by step guidance1
Recall that the principal quantum number \(n\) determines the main energy level or shell of an electron in an atom.
Understand that for each principal quantum number \(n\), the number of sublevels (or subshells) is equal to \(n\).
Each sublevel corresponds to a different value of the azimuthal quantum number \(l\), which ranges from \$0\( to \)n-1$.
For \(n = 3\), the possible values of \(l\) are \$0\(, \)1\(, and \)2$, which correspond to the sublevels 3s, 3p, and 3d respectively.
Therefore, the number of sublevels in the \(n = 3\) energy level is 3.
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