Which property makes iridium especially valued for use in corrosive or high-temperature environments?

Exceptional corrosion resistance

Iridium is sometimes used in spark plugs for which reason?

Long electrode life due to high melting point and corrosion resistance

To make sparks larger for ignition

Because it is inexpensive and disposable

Trivia · Knowledge

Test your knowledge of iridium (Z=77): its corrosion resistance, industrial uses, notable isotopes, and historic roles in alloys and jewelry.0 takes

Preview · 10 questions

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