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# Quantum Number Electron 40

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Please follow the Aufbau principle, Pauli exclusion principle, and Hund's rule to determine the four quantum numbers (principle, angular, magnetic, spin) for the final electron of the listed element.

Zirconium

Example: The final electron of $Be$ is 4.

A

$3,2,-2,+1/2$

B

$5,1,0,-1/2$

C

$4,0,0,-1/2$

D

$1,0,0,-1/2$

E

$4,2,-1,+1/2$