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Oxidation number: Quiz


Question 1: In coordination chemistry, the oxidation number of a central ________ in a coordination compound is the charge that it would have if all the ligands were removed along with the electron pairs that were shared with the central atom[1] (in a coordination compound, all shared electron pairs are donated by the ligands).

Question 2: To be more precise, however, oxidation number is used in coordination chemistry with a slightly different meaning since the rules used for counting electrons are different: every electron belongs to the ligand, regardless of ________.
ElectronegativityPeriodic tableNoble gasHalogen

Question 3: It is represented by a ________; the plus sign is omitted for positive oxidation numbers.
LatinRoman RepublicRoman numeralsRoman Republican currency

Question 4: Formal oxidation numbers require particular caution for molecules where the bonding is covalent, since the formal oxidation numbers require the heterolytic removal of ________, which essentially denies covalency.
Crystal field theoryHSAB theoryLigandCoordination complex

Question 5: The oxidation number is usually numerically equal to the ________ and so the terms oxidation state and oxidation number are often used interchangeably.
HydrogenOxidation stateOxygenOxide

Question 6: The oxidation state can differ from the oxidation number in a few cases where the ligand atom is less electronegative than the central atom (e.g., in ________ phosphine complexes), resulting in a formal oxidation state that is different from the oxidation number.


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