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nature : also known as the atomic number of effective rules. The price of the transition elements is a layer s orbit, three p orbit and 5 d track, a total of nine can be used to track price acceptable ligand for the valence electron and accommodate metal atoms or ions the valence electron. If the 18 electronics, compared with the electronic stability configurations. But many exceptions, the single-coordination compounds the valence electrons can be as little as a few 12, as TiF2-6; More than 22, such as Zn (en) < 2 + / sup>s _3. Organic compounds generally follows, such as Ni (CO) 4, Fe (CO) 5 (C5H5) 2F (C6Hs _6) are all 18 2Cr electronic system. But there are exceptions, such as (C5H5) 2Co 19, V (CO) 6 17, [Pt (C2H4) Cl3 ] - 16 electronic system.
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