Open Question
Which part of the periodic table indicates the number of energy levels in the electron cloud?
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9. Quantum Mechanics
Quantum Numbers: Principal Quantum Number
Multiple Choice
How many orbitals are there in the third shell (n=3)?
A
6
B
12
C
3
D
9
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Verified step by step guidance1
Understand that the principal quantum number, n, determines the shell level. Here, n=3 indicates the third shell.
Recall that the number of orbitals in a shell is given by the formula n^2, where n is the principal quantum number.
Substitute n=3 into the formula to calculate the number of orbitals: n^2 = 3^2.
Calculate 3^2 to find the total number of orbitals in the third shell.
Conclude that the third shell (n=3) contains 9 orbitals, as calculated from the formula.
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