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Which platinum-group metals are most resistant to corrosion or high temperatures?

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rhodium — platinum group Rhodium foil and wire.

Within the platinum group, specific metals are distinguished by their resistance to environmental and thermal stressors:

Corrosion Resistance: Iridium is recognized as the most corrosion-resistant metal among the group.1
High-Temperature Performance: Rhodium is particularly valued for its ability to retain its physical and chemical properties when subjected to high temperatures.1

While osmium possesses the highest melting point of the group, it is limited by its tendency to oxidize readily. Platinum also exhibits notable resistance to corrosion and high temperatures, making it a standard choice for laboratory equipment like crucibles and for use in electrical contacts.12