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Heavy metal (chemistry): Quiz

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Question 1: Living organisms require varying amounts of "heavy metals." ________, cobalt, copper, manganese, molybdenum, and zinc are required by humans.
NickelChromiumIronOxygen

Question 2: It does not include elements such as oxygen that may be bonded to the fuel metals, or cladding materials such as ________, which might be considered heavy metals by some other standards.
HafniumTitaniumZirconiumYttrium

Question 3: Other heavy metals such as mercury, plutonium, and lead are toxic metals that have no known vital or beneficial effect on organisms, and their accumulation over time in the bodies of ________ can cause serious illness.
CtenophoraBilateriaAnimalCnidaria

Question 4: Many different definitions have been proposed—some based on density, some on ________ or atomic weight, and some on chemical properties or toxicity.
HafniumAtomic numberPeriodic tableChemical element

Question 5: A heavy metal is a member of an ill-defined subset of elements that exhibit metallic properties, which would mainly include the ________, some metalloids, lanthanoids, and actinides.
ActinoidPeriodic tableNoble gasTransition metal

Question 6: Examples include vanadium, tungsten, and even ________.
CadmiumSilverZincGold

Question 7: Electroplating is the primary source of chromium and ________.
SilverCadmiumGoldZinc

Question 8: This definition excludes ________, the heaviest of approximately stable elements, because of its low toxicity.
BismuthLeadAntimonyZinc

Question 9: [1] The term heavy metal has been called "meaningless and misleading" in an ________ technical report due to the contradictory definitions and its lack of a "coherent scientific basis".
IUPAC nomenclatureInternational Union of Pure and Applied ChemistryPotassiumCarbon

Question 10: Heavy metals in a ________ (or "hazmat") setting are for the most part classified in "Misc." on the UN model hazard class, but they are sometimes labeled as a poison when being transported.
ChlorineNitrogenNFPA 704Dangerous goods







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