Chemistrymedium · Past Paper
What is the subshell electronic configuration of Potassium (At. No. 19)?
A1s2 2s2 2p6 3s2 3p6 3d1
B1s2 2s2 2p6 3s2 3p7
C1s2 2s2 2p6 3s2 3p6 4s1
D1s2 2s2 2p6 3s2 3p6 4s2
✓ Correct Answer: C — 1s2 2s2 2p6 3s2 3p6 4s1
Potassium follows the Aufbau principle where the 4s orbital is filled before the 3d orbital.
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