Quizzes · Knowledge
Iridium (Ir) — corrosion resistance, isotopes and jewelry: Multiple Choice
Preview · 10 questions
- 01How many naturally occurring stable isotopes does iridium have?
- 02Iridium is commonly alloyed with which metal to make the international kilogram prototype (the historical standard kilogram)?
- 03Iridium's extreme corrosion resistance makes it most similar in behavior to which neighboring precious metal?
- 04Which property makes iridium especially valued for use in corrosive or high-temperature environments?
- 05Which radioactive isotope of iridium is widely used in industrial radiography and some medical applications?
- 06Which of these is a correct pair of the two stable isotopes of iridium?
- 07What is the atomic number of iridium?
- 08Which historical alloy containing iridium (often mixed with osmium) was used for durable pen nib tips and other hard-wearing items?
- 09Which characteristic of iridium contributes to its use in high-temperature alloys for jet engines and crucibles?
- 10Iridium is sometimes used in spark plugs for which reason?