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Valence (chemistry): Quiz


Question 1: One of the first examples to be identified was ________, which sometimes behaves as if it has a valence of three and sometimes as if it has a valence of five.

Question 2: ________ is the element for which the largest number of atoms combine with atoms of other elements: it is univalent in all compounds except the ion [H2F]+.

Question 3: Chlorine forms a number of ________ClF, ClF3 and ClF5—and its valence according to the IUPAC definition is hence five.
FluorineFluoride poisoningFluorideSodium fluoride

Question 4: The concept was developed in the middle of the nineteenth century in an attempt to rationalize the formulae of different ________.
Inorganic chemistryElectrochemistryChemical compoundChemistry

Question 5: For example, in many of their compounds, ________ forms four bonds, oxygen two and hydrogen one.

Question 6: "Valence"PDF (2.70 KiB) from the ________ Gold Book
CarbonIUPAC nomenclaturePotassiumInternational Union of Pure and Applied Chemistry

Question 7: Exceptions in the case of hydrogen include the bifluoride ion, [HF2], and the various boron hydrides such as ________: these are examples of three-center bonds.
Boron trioxideAmmoniaDiboraneBoron trichloride

Question 8: The ________ (IUPAC) has made several attempts to arrive at an unambiguous definition of valence.
International Union of Pure and Applied ChemistryIUPAC nomenclatureCarbonPotassium

Question 9: In chemistry, valence, also known as valency or valency number, is a measure of the number of chemical bonds formed by the ________ of a given element.


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