A.一定為8個電子 B.一定為18個電子 C.一定為8~18個電子 D.一定為8~32個電子
A.1s12s12p1 B.1s22s22p1 C.1s22s22p3 D.1s22s22p7
A.1s22s22p4 B.1s22s22p63s23p6 C.1s22s22p3 D.1s22s22p63d1