LIVEAX₃ · 3 bonding domains · 0 lone pairs · 120° · planar

3D Trigonal Planar Geometry

Three bonds spread into one flat plane

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Mission: reveal the flat triangle

Rotate the molecule, inspect its three bonding regions, and test why equal repulsions settle at 120 degrees.

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Bond angle 120°

Bond length 1.30×

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AX₃ → 3 domains → 120°

3bonding domains

0central lone pairs

0.00out-of-plane

100%ideal geometry

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Steric number = bonding domains + central lone pairs
3 = 3 + 0 → trigonal planar
Ideal bond-angle sum = 3 × 120° = 360°

Why is a double bond counted as one electron domain in VSEPR?
Which molecular examples are symmetric, and which are still trigonal planar but polar?
How does resonance make the three bonds equivalent in carbonate and nitrate?

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