From the activity list included in this problem,which element/ion is the most difficult to oxidize?
Activity Series = 
Definitions:
Joseon Dynasty
A Korean dynastic kingdom that lasted for approximately five centuries, noted for its cultural achievements and advancements.
Seoul
The capital and largest city of South Korea, known for its vibrant culture, historical landmarks, and advanced technology.
Gyeonbok Palace
A royal palace located in Seoul, South Korea, which was the main palace of the Joseon dynasty.
Cobalt-Blue Porcelain
Porcelain wares characterized by their vibrant cobalt-blue decorations under a transparent glaze, popular in East Asia and Europe.
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