Iron is a transition metal in Group 8 of the Periodic Table. Explain why iron has variable oxidation states. ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. (ii) Complete the shorthand electronic configurations of Fe and $$$\mathrm{Fe}^{3+}$$$. Fe $$$[$$$ Ar $$$]$$$ ................................................................................................................... $$$\mathrm{Fe}^{3+} \quad[\mathrm{Ar}]$$$ ...................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_m24_qp_42 Year：2024 Question No：3(a)

Answer:

Knowledge points:

28.1.1 define a transition element as a d-block element which forms one or more stable ions with incomplete d orbitals

28.1.2 sketch the shape of a orbital

28.1.3.1 they have variable oxidation states

28.1.3.2 they behave as catalysts

28.1.3.3 they form complex ions

28.1.3.4 they form coloured compounds

28.1.4 explain why transition elements have variable oxidation states in terms of the similarity in energy of the 3d and the 4s sub-shells

28.1.5 explain why transition elements behave as catalysts in terms of having more than one stable oxidation state, and vacant d orbitals that are energetically accessible and can form dative bonds with ligands

28.1.6 explain why transition elements form complex ions in terms of vacant d orbitals that are energetically accessible

Answer:

Knowledge points:

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