We’re being asked to determine the number of orbitals contained in the third principal level (n = 3).
Recall that the quantum numbers that define an electron are:
• Principal Quantum Number (n): deals with the size and energy of the atomic orbital.
The possible values for n are 1 to ∞.
• Angular Momentum Quantum Number (l): deals with the shape of the atomic orbital.
The possible values for l are 0 to (n – 1).
• Magnetic Quantum Number (ml): deals with the orientation of the atomic orbital in 3D space.
The possible values for ml are the range of l: –l to +l.
How many orbitals are contained in the third principal level (n=3) of a given atom?
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