Chemistry — VSEPR Geometry
Electron-pair count and the resulting molecular shape.
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2\ \text{pairs} \rightarrow \text{linear } (180^\circ)
3 \rightarrow \text{trigonal planar } (120^\circ)
4 \rightarrow \text{tetrahedral } (109.5^\circ)
6 \rightarrow \text{octahedral } (90^\circ)