Frequently Asked Question

Questions asked by users might not always be phrased in the clearest way.

What are the four quantum numbers that describe the last electron in Np?

Accepted Answer

The last electron in Neptunium (Np) is in the 5f subshell. Here's how we determine its quantum numbers:

Principal Quantum Number (n): 5 (because it's in the 5th energy level)
Angular Momentum Quantum Number (l): 3 (for f orbitals)
Magnetic Quantum Number (ml): -3 to +3 (since there are 7 f orbitals, ml values range from -l to +l)
Spin Quantum Number (ms): +1/2 or -1/2 (since there can be only two electrons per orbital, with opposite spins)


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