Molybdenum steel is hard when hot and is used in cutting tools. Technetium is radioactive and never occurs in nature. It is used as a radioactive tracer element in the bloodstream to diagnose heart disease. Ruthenium resists corrosion and is used in electric contacts. Rhodium is used in laboratory crucibles because it doesn't react with the chemicals heated in the crucible.
Palladium is used in catalytic converters in cars to reduce pollution.
Cadmium is used in rechargeable batteries. Indium is used in electronic devices, such as diodes. Tellurium is used in solar cells and light detectors. Iodine is very active and kills germs. Xenon is an inert gas used in bright lighthouse lamps.