问答题 How many unpaired electrons are present in each of the following?
   (a)[CoF6]3- (high-spin);(b)[Co(en)3]3+ (low-spin);(c)[Mn(CN)6]3- (low-spin);(d)[Mn(CN)6]4- (low-spin);(e)[MnCl6]4- (high-spin);(f)[RhCl6]3- (low-spin)。
【正确答案】
complx
M
electron configuration
t2g
eg
unpaired electrons
(a)
【CoF63-
Co3+
3d64s0
↑↓   ↑  ↑   
4
(b)
【Co(en)33+
Co3+
3d64s0
↑↓ ↑↓ ↑↓    
0
(c)
【Mn(CN)63-
Mn3+
3d44s0
↑↓ ↑  ↑     
2
(d)
【Mn(CN)64-
Mn2+
3d54s0
↑↓ ↑↓ ↑     
1
(e)
【MnCl64-
Mn2+
3d54s0
↑  ↑  ↑  ↑  ↑ 
5
(f)
【RhCl63-
Rh3+
4d65s0
↑↓ ↑↓ ↑↓    
0
【答案解析】