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Actinoid: Quiz


Question 1: The actinide or actinoid (________) series encompasses the 14 chemical elements with atomic numbers from 90 to 103, thorium to lawrencium.
CAS registry numberChemistryChemical compoundIUPAC nomenclature

Question 2: ________, U(C8H8)2, is particularly interesting for the presence of the planar, Huckel rule aromatic cyclooctatrenyl anion, analogous to the cyclopentadenyl ion found in ferrocene.

Question 3: ________, the principal investigator, found that americium and curium did not have the properties to be expected of transition elements.
Roger AdamsRonald BreslowMelvin CalvinGlenn T. Seaborg

Question 4: They may be created in a nuclear explosion and come to earth as ________ from an atmospheric test explosion.
Environmental radioactivityRadioactive contaminationNuclear weaponNuclear fallout

Question 5: Transitions between 5f and 6d orbitals can be observed in the ________ region of the spectrum.
Electromagnetic spectrumX-rayUltravioletVisible spectrum

Question 6: An ________ of an actinoid is known as an organoactinoid.
Periodic tableOrganometallic chemistryAlkeneInorganic chemistry

Question 7: There is strong spin-orbit coupling, but weak ________ splitting, so there is little colour variation in compounds of a given element in a given oxidation state.
LigandCoordination complexAmmoniaCrystal field theory

Question 8: Prior to 1945, it was generally thought, following ________, that thorium and uranium were transition metals in groups 4 and 6 respectively.
RussiansAlexander BlokRussiaDmitri Mendeleev

Question 9: The assumption was that the ________ would also have the properties of transition metals.
CaliforniumPlutoniumTransuranium elementCurium

Question 10: The transuranium elements were first synthesized as part of the ________ in around 1944.
World War IITechnology during World War IIAerial warfareManhattan Project


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