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| actinide series | (also, actinoid series) actinium and the elements in the second row or the f-block, atomic numbers 89–103
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| bidentate ligand | ligand that coordinates to one central metal through coordinate bonds from two different atoms
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| central metal | ion or atom to which one or more ligands is attached through coordinate covalent bonds
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| chelate | complex formed from a polydentate ligand attached to a central metal
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| chelating ligand | ligand that attaches to a central metal ion by bonds from two or more donor atoms
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| cis configuration | configuration of a geometrical isomer in which two similar groups are on the same side of an imaginary reference line on the molecule
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| coordination compound | stable compound in which the central metal atom or ion acts as a Lewis acid and accepts one or more pairs of electrons
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| coordination compound | substance consisting of atoms, molecules, or ions attached to a central atom through Lewis acid-base interactions
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| coordination number | number of coordinate covalent bonds to the central metal atom in a complex or the number of closest contacts to an atom in a crystalline form
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| coordination sphere | central metal atom or ion plus the attached ligands of a complex
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| crystal field splitting (Δoct) | difference in energy between the t2g and eg sets or t and e sets of orbitals
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| crystal field theory | model that explains the energies of the orbitals in transition metals in terms of electrostatic interactions with the ligands but does not include metal ligand bonding
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| d-block element | one of the elements in groups 3–11 with valence electrons in d orbitals
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| donor atom | atom in a ligand with a lone pair of electrons that forms a coordinate covalent bond to a central metal
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| eg orbitals | set of two d orbitals that are oriented on the Cartesian axes for coordination complexes; in octahedral complexes, they are higher in energy than the t2g orbitals
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| f-block element | (also, inner transition element) one of the elements with atomic numbers 58–71 or 90–103 thathave valence electrons in f orbitals; they are frequently shown offset below the periodic table
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| first transition series | transition elements in the fourth period of the periodic table (first row of the d-block), atomic numbers 21–29
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| fourth transition series | transition elements in the seventh period of the periodic table (fourth row of the d-block), atomic numbers 89 and 104–111
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| geometric isomers | isomers that differ in the way in which atoms are oriented in space relative to each other, leading to different physical and chemical properties
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| high-spin complex | complex in which the electrons maximize the total electron spin by singly populating all of the orbitals before pairing two electrons into the lower-energy orbitals
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| hydrometallurgy | process in which a metal is separated from a mixture by first converting it into soluble ions, extracting the ions, and then reducing the ions to precipitate the pure metal
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| ionization isomer | (or coordination isomer) isomer in which an anionic ligand is replaced by the counter ion in the inner coordination sphere
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| lanthanide series | (also, lanthanoid series) lanthanum and the elements in the first row or the f-block, atomic numbers 57–71
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| ligand | ion or neutral molecule attached to the central metal ion in a coordination compound
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| linkage isomer | coordination compound that possesses a ligand that can bind to the transition metal in two different ways (CN− vs. NC−)
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| low-spin complex | complex in which the electrons minimize the total electron spin by pairing in the lower-energy orbitals before populating the higher-energy orbitals
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| monodentate | ligand that attaches to a central metal through just one coordinate covalent bond
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| optical isomer | (also, enantiomer) molecule that is a nonsuperimposable mirror image with identical chemical and physical properties, except when it reacts with other optical isomers
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| pairing energy (P) | energy required to place two electrons with opposite spins into a single orbital
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| platinum metals | group of six transition metals consisting of ruthenium, osmium, rhodium, iridium, palladium, and platinum that tend to occur in the same minerals and demonstrate similar chemical properties
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| polydentate ligand | ligand that is attached to a central metal ion by bonds from two or more donor atoms, named with prefixes specifying how many donors are present (e.g., hexadentate = six coordinate bonds formed)
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| rare earth element | collection of 17 elements including the lanthanides, scandium, and yttrium that often occur together and have similar chemical properties, making separation difficult
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| second transition series | transition elements in the fifth period of the periodic table (second row of the d-block), atomic numbers 39–47
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| smelting | process of extracting a pure metal from a molten ore
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| spectrochemical series | ranking of ligands according to the magnitude of the crystal field splitting they induce
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| steel | material made from iron by removing impurities in the iron and adding substances that produce alloys with properties suitable for specific uses
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| strong-field ligand | ligand that causes larger crystal field splittings
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| superconductor | material that conducts electricity with no resistance
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| t2g orbitals | set of three d orbitals aligned between the Cartesian axes for coordination complexes; in octahedral complexes, they are lowered in energy compared to the eg orbitals according to CFT
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| third transition series | transition elements in the sixth period of the periodic table (third row of the d-block), atomic numbers 57 and 72–79
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| trans configuration | configuration of a geometrical isomer in which two similar groups are on opposite sides of an imaginary reference line on the molecule
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| weak-field ligand | ligand that causes small crystal field splittings
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