A p orbital is an orbital with angular momentum quantum number l = 1; it has a dumbbell shape with two lobes on either side of the nucleus. There are three p orbitals in each subshell that has them, oriented along the x, y, and z axes. Their directional shapes, unlike the spherical s orbital, are important in determining molecular geometry.

p 轨道是角动量量子数 l = 1 的轨道;它呈哑铃形,在原子核两侧各有一个瓣。在含 p 轨道的每个亚层中有三个 p 轨道,分别沿 x、y、z 轴取向。与球形的 s 轨道不同,它们的方向性形状在决定分子几何构型时很重要。