2. 核外电子排布式
Na+________________
Cl-________________
Fe________________
Fe3+________________
N________________
Cr________________
Cu________________
Ti________________
Ni________________
答案:1s22s22p6 1s22s22p63s23p6
1s22s22p63s23p63d64s2 1s22s22p63s23p63d5
1s22s22p3 1s22s22p63s23p63d54s1
1s22s22p63s23p63d104s1 1s22s22p63s23p63d24s2
1s22s22p63s23p63d84s2