19.4: Key Terms
- Page ID
- 415294
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Words (or words that have the same definition) | The definition is case sensitive | (Optional) Image to display with the definition [Not displayed in Glossary, only in pop-up on pages] | (Optional) Caption for Image | (Optional) External or Internal Link | (Optional) Source for Definition |
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(Eg. "Genetic, Hereditary, DNA ...") | (Eg. "Relating to genes or heredity") | The infamous double helix | https://bio.libretexts.org/ | CC-BY-SA; Delmar Larsen |
Word(s) | Definition | Image | Caption | Link | Source |
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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 | ||||
bidentate ligand | ligand that coordinates to one central metal through coordinate bonds from two different atoms | ||||
central metal | ion or atom to which one or more ligands is attached through coordinate covalent bonds | ||||
chelate | complex formed from a polydentate ligand attached to a central metal | ||||
chelating ligand | ligand that attaches to a central metal ion by bonds from two or more donor atoms | ||||
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 | ||||
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 | ||||
coordination compound | substance consisting of atoms, molecules, or ions attached to a central atom through Lewis acid-base interactions | ||||
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 | ||||
coordination sphere | central metal atom or ion plus the attached ligands of a complex | ||||
crystal field splitting (Δoct) | difference in energy between the t2g and eg sets or t and e sets of orbitals | ||||
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 | ||||
d-block element | one of the elements in groups 3–11 with valence electrons in d orbitals | ||||
donor atom | atom in a ligand with a lone pair of electrons that forms a coordinate covalent bond to a central metal | ||||
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 | ||||
f-block element | (also, inner transition element) one of the elements with atomic numbers 58–71 or 90–103 that have valence electrons in f orbitals; they are frequently shown offset below the periodic table | ||||
first transition series | transition elements in the fourth period of the periodic table (first row of the d-block), atomic numbers 21–29 | ||||
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 | ||||
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 | ||||
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 | ||||
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 | ||||
ionization isomer | (or coordination isomer) isomer in which an anionic ligand is replaced by the counter ion in the inner coordination sphere | ||||
lanthanide series | (also, lanthanoid series) lanthanum and the elements in the first row or the f-block, atomic numbers 57–71 | ||||
ligand | ion or neutral molecule attached to the central metal ion in a coordination compound | ||||
linkage isomer | coordination compound that possesses a ligand that can bind to the transition metal in two different ways (CN− vs. NC−) | ||||
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 | ||||
monodentate | ligand that attaches to a central metal through just one coordinate covalent bond | ||||
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 | ||||
pairing energy (P) | energy required to place two electrons with opposite spins into a single orbital | ||||
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 | ||||
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) | ||||
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 | ||||
second transition series | transition elements in the fifth period of the periodic table (second row of the d-block), atomic numbers 39–47 | ||||
smelting | process of extracting a pure metal from a molten ore | ||||
spectrochemical series | ranking of ligands according to the magnitude of the crystal field splitting they induce | ||||
steel | material made from iron by removing impurities in the iron and adding substances that produce alloys with properties suitable for specific uses | ||||
strong-field ligand | ligand that causes larger crystal field splittings | ||||
superconductor | material that conducts electricity with no resistance | ||||
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 | ||||
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 | ||||
trans configuration | configuration of a geometrical isomer in which two similar groups are on opposite sides of an imaginary reference line on the molecule | ||||
weak-field ligand | ligand that causes small crystal field splittings |