Chemistry — Orbital Hybridisation
Hybrid orbitals and the shapes they give.
Rendering…
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sp:\ \text{linear } (180^\circ)
sp^2:\ \text{trigonal planar } (120^\circ)
sp^3:\ \text{tetrahedral } (109.5^\circ)
\sigma\ \text{(head-on)} + \pi\ \text{(sideways)}