Chemistry / Unit 6 Chem 1043 short lesson, about 20 seconds
Two-Domain Geometry: Linear
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The idea
A central atom with two electron domains and no lone pairs adopts a linear electron-pair and molecular geometry, a 180° bond angle.
In practice
Beryllium fluoride, BeF2, with two bonding domains and no lone pairs on beryllium, is linear.
Where people slip
Linear geometry from two domains requires zero lone pairs on the central atom — a lone pair would change the count.
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