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Periodicity (Periodic trend (physical properties (ionic radius, atomic…

- - - - down the group, 电子层数依次增大，但effective nuclear charge不变，所以distance between outer shell and nuclear increase
      - across the period, 电子层数不变，effective nuclear charge变大
- - - - reasons for colors of transition metal
        
        spliting of d-orbital
        
        jump back and release the energy
        
        complementary color
        
        incomplete d-orbital
        
        electrons will jump to higher engergy level when absorbs energy
      - the spectrochemical series（arranged in ability to split d-orbital）
      - factors affecting color
        
        oxidation states 失去电子数不一样，后果同上
        
        identity of ligand，由于spectrochemical 强度不一样
        
        nature of metal 不同金属的3d层电子个数不一样，分裂后能量差不一样，释放的能量也不一样
        
        stereochemistry of complex，形状不一样，d-orbital分裂时放出能量也不一样
    - - coordination number
        
        4-tetrahedral
        
        6-octahedral
        
        2-linear
      - ligand type
        
        polydentate
        
        hexadentate
        
        bidentate
        
        monodentate
      - central metal ion