P元素为15号元素,原子核外有15个电子,所以核外电子排布式为:1s22s22p63s23p3,故答案为1s22s22p63s23p3;
Cr元素为24号元素,原子核外有24个电子,所以核外电子排布式为:1s22s22p63s23p63d54s1,故答案为:1s22s22p63s23p63d54s1;
Al元素为13号元素,原子核外有13个电子,所以核外电子排布式为:1s22s22p63s23p1,故答案为:1s22s22p63s23p1;
Cu元素为29号元素,原子核外有29个电子,所以核外电子排布式为:1s22s22p63s23p63d104s1,故答案为:1s22s22p63s23p63d104s1.