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Marcia
Ex: PCl5 Z = 15 1s² 2s² 2p⁶ 3s² 3p³ Z = 17 1s² 2s² 2p⁶ 3s² 3p⁵
3s ↑↓ 3p ↑ ↑ ↑
3s ↑↓ 3p ↑ ↑ ↑ 3d ↑ ↑ ↑ ↑ ↑
↑ ↑ ↑ ↑ ↑
sp³d
d d P d d
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