5.3 Transition metals definitions 0.0 / 5 ? ChemistryTransition metalsA2/A-levelOCR Created by: hollie.holmesCreated on: 12-03-19 17:38 transition element D-block elements forming one or more stable ions with partislly (incomplete) d-subshells. 1 of 11 Electron configuration of a chromium atom 1s2 2s2 2p6 3s2 3p6 3d5 4s1 2 of 11 Electron configuration of a copper atom 1s2 2s2 2p6 3s2 3p6 3d10 4s1 3 of 11 complex ion a metal ion surrounded by co-ordinately bonded atoms 4 of 11 ligand an atom, ion or molecule which can donate a lone electron pair to form a co-ordinate bond to a metal ion or metal (that's a transition metal) 5 of 11 co-ordination number the number of co-ordinate bonds formed to a central metal ion 6 of 11 unidentate ligand these are ligands which can only form 1 co-ordinate bond per ligand. E.g. H2O, NH3, Cl, CN- 7 of 11 bidentate ligand these have 2 atoms with lone pairs and can form 2 co-ordinate bonds per ligand. E.g. NH2CH2CH2NH2 [en] or ethanedioate ion C2O4-2 8 of 11 mutlidentate ligand these can form 6 co-ordinate bonds per ligand. E.g. EDTA4- 9 of 11 ligand substitution this is when 1 ligand is swapped for another. Usually resulting in a colour change, 10 of 11 copper (II) ions and ammonia [Cu (H2O)6]3+ + 6NH3 --> [Cu(NH3)4(H2O)2]2+ + 4H2O 11 of 11
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