To answer this question, we need to identify the Greek name for the metal potassium.
Option A) Natrium - This option is incorrect because natrium is the Latin name for sodium, not potassium.
Option B) Kalium - This option is correct. Kalium is the Greek name for the element potassium.
Option C) Wofram - This option is incorrect. Wofram is the German name for the element tungsten, not potassium.
Option D) Atrium - This option is incorrect. Atrium is not a valid Greek or Latin name for any metal.
The correct answer is B) Kalium. This option is correct because Kalium is the Greek name for the metal potassium.