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Nuclide: Quiz

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Question 1: The most long-lived non-ground-state nuclear isomer is tantalum-180m, which has a halflife in excess of 1000 trillion years, and has not been observed to decay to ________.
Isotopes of tantalumHafniumTungstenCobalt

Question 2: of the same ________, but different neutron numbers, are called isotopes of the element.
Chemical elementHeliumCarbonHydrogen

Question 3: Firstly, those whose half-lives T½ are at least 10% as long as the age of the ________ (4.6×109 years).
EarthMoonSunNature

Question 4: A set of nuclides with equal ________ (atomic number), i.e.
HafniumPeriodic tableChemical elementAtomic number

Question 5: This is so because the ________, or more precisely: the average relative atomic mass Ar(E) of an element E, is calculated from the relative atomic masses of its isotopes weighted with their atomic abundances.
Atomic weightBoronAvogadro constantFluorine

Question 6: ________ are members of a set of nuclides with equal proton number and equal mass number, but different states of excitation.
Nuclear isomerPlutoniumTechnetiumHafnium

Question 7: A set of nuclides with equal mass number A but different ________ are called isobars (isobar = equal in weight), and isotones are nuclides of equal neutron number but different proton numbers.
Atomic numberChemical elementPeriodic tableHafnium

Question 8: Unstable nuclides are ________ and are called radionuclides.
Radioactive decayNuclear fissionNuclear fusionGamma ray







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