@表山年花 省级精品课程申报 A.IArl3d'4s B.IAr]3d4s C.IArl3d54s D IAr]3d'4s' 答：C。 24.What are the possible values of /for an electron with n=2? 答：0,1 25 What are the possible values of m for an electron with/-2 答：-2，-1,0，+1，+2 26.What are the possible values of s for an electron with m=0? 答：+1/2或-1/2，与其他量子数的取值无关。 27 Which of the following represents a reasonable set of quantum number? A.2,2,2,+1/2 B.2,2,1,+1/2 C.4,2,3,+1/2 D.2,0,0,+1/2 答：D。 28.The atom with lowest atomic number and a completely filled 3d subshell in the ground state is A.Cu B.Ar C.Cr D.Zn 答：A。 29.An ion with five unpaired electrons in its ground state is A.Cr B.Fe C.Mn3 D.Ni 答：B。 30.The atom with lowest atomic number that has a ground state electronic configuration of (n-1)d'ns2 is in the A.2 period 2 C.4 period 4 D.5th period 5 答：C