P的电子组态为：3s2 3p3 ；不成对的电子有3p3
3p1：n = 3 l = 1 m = 0 ms = + 1/2
3p1：n = 3 l = 1 m = +1 ms = + 1/2
3p1：n = 3 l = 1 m = -1 ms = + 1/2
三个电子的区别是磁量子数不同,自旋量子数一定要相同,或者全部为 -1/2