- 1s, 2s, 2p, 3s, 3p, 3d.
- 1s, 2s, 2p, 3s, 3p, 4s.
- 1s, 2s, 2p, 3d, 4s, 3p.
- 1s, 2s, 2p, 3s, 4s, 3p.
What is the order of filling orbitals for Potassium (Z=19)?
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