What is the Rarest Metal on Earth?

By GovMint :

The rarest metal in the world is arguably rhodium, which is part of the platinum group of metals. In terms of abundance, other rare metals that occur on Earth include gold, platinum, osmium, palladium, iridium, tellurium, and rhenium. Discovered in the early 1800s, rhodium is prized for its rarity and its use in various industrial applications, such as in the creation of catalytic converters for automobiles. Rhodium is also highly resistant to corrosion and oxidation, making it a useful component in jewelry and other high-end applications.

Sources Used:

https://science.howstuffworks.com/rhodium.htm