Linear geometry is a molecular shape in which the atoms lie in a straight line, giving a bond angle of 180°. It arises when there are two electron domains around the central atom with no lone pairs to distort them. Beryllium chloride (BeCl₂) is an example of a molecule with linear geometry.

直线形几何是原子排成一条直线、键角为 180° 的分子形状。当中心原子周围有两个电子域且没有孤对使之畸变时即出现这种形状。氯化铍(BeCl₂)就是直线形几何分子的例子。