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Terbium: Quiz


Question 1: 33 radioisotopes have been characterized, with the most stable being 158Tb with a ________ of 180 years, 157Tb with a half-life of 71 years, and 160Tb with a half-life of 72.3 days.
Cosmic rayHalf-lifeNuclear fissionRadioactive decay

Question 2: Terbium is never found in nature as a free element, but it is contained in many ________, including cerite, gadolinite, monazite, xenotime and euxenite.

Question 3: As a component of Terfenol-D, terbium is of use in actuators, in naval sonar systems, ________, in the SoundBug device (its first commercial application), and other magnetomechanical devices.

Question 4: The primary decay products before 159Tb are element Gd (gadolinium) isotopes, and the primary products after are element Dy (________) isotopes.

Question 5: The yttrofluorite variety of the mineral ________ owes its creamy-yellow fluorescence in part to terbium.
FluoriteGalenaUnited StatesQuartz

Question 6: Terbium (pronounced /ˈtɜrbiəm/, TER-bee-əm) is a chemical element with the symbol Tb and ________ 65.
Atomic numberPeriodic tableLanthanumHafnium

Question 7: ________ terbium borate is used in solid state devices.

Question 8: Terbium is used to dope calcium fluoride, calcium tungstate and strontium molybdate, materials that are used in solid-state devices, and as a crystal stabilizer of ________ which operate at elevated temperatures.
Fuel cellLead-acid batteryZinc-air batteryFlow battery

Question 9: Crushed terbium-containing minerals are treated with hot concentrated ________ to produce water-soluble sulfates of rare earths.
AmmoniaAcetic acidHydrochloric acidSulfuric acid

Question 10: Naturally occurring terbium is composed of 1 stable ________, 159Tb.
TechnetiumIsotopeStable nuclideAtom


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