Q. Which of these elements is not named after a scientist?
Answer: Ruthenium
Notes: Ruthenium derives its name from "Ruthenia", a historical region in Central Europe, rather than a scientist. Conversely, Einsteinium is named in honor of Albert Einstein, Curium pays tribute to Pierre and Marie Curie, and Borium is dedicated to Niels Bohr. This naming convention is often used in scientific disciplines to honor key contributors to the field.

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