First row d-block elements answers

1. A transition element contains an incomplete d sub-level in one or more of its oxidation states.Zinc loses the two 4s electrons to form zinc(II) compounds. Zn2+ has a full 3d level so compounds of zinc(II) do not contain an incomplete d sub-level.2. All transition elements except chromium and copper contain two 4s electrons. They lose these to form the 2+ ion. Chromium and copper can also lose one of their 3d electrons...

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