Group 9. Expensive metals that you've never heard of.
With the exception of meitnerium, metals in this group are not radioactive. Iridium and rhodium are extremely high-valued metals, with rhodium being one of the most expensive metals in the world. Meitnerium is the least useful as it serves only as a lab experiment with no real purpose. Cobalt's salts are used for its blue color. It is the only element in this group that is found in human bodies in the form of vitamin B12. Iridium can be used for pen tips, while rhodium is used for more precious things such as jewelry. Iridium's melting point is the highest out of all the elements in this group, thus it is (like osmium) also used to harden platinum and is used for electrical contacts.