Describe in detail the rare metals and metalloids.  

Rare metals and metalloids are a group of elements that are typically characterized by their limited abundance in the Earth's crust and their unique physical and chemical properties. These elements play important roles in a variety of industrial and technological applications, such as electronics, energy production, and medical devices.

Some of the most important rare metals include:

1. Platinum Group Metals (PGMs) - these include platinum, palladium, ______ _______ ________ ___ ___ ______ _________ ________ ___.
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